802 lines
26 KiB
C#
802 lines
26 KiB
C#
// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
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using System;
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using System.Collections.Generic;
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namespace FlaxEngine.GUI
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{
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/// <summary>
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/// Dropdown menu control allows to choose one item from the provided collection of options.
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/// </summary>
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/// <seealso cref="FlaxEngine.GUI.ContainerControl" />
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public class Dropdown : ContainerControl
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{
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/// <summary>
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/// The root control used by the <see cref="Dropdown"/> to show the items collections and track item selecting event.
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/// </summary>
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/// <seealso cref="FlaxEngine.GUI.Panel" />
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[HideInEditor]
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protected class DropdownRoot : Panel
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{
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/// <summary>
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/// Occurs when popup lost focus.
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/// </summary>
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public Action LostFocus;
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/// <summary>
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/// The selected control. Used to scroll to the control on popup creation.
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/// </summary>
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public ContainerControl SelectedControl = null;
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/// <summary>
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/// The main panel used to hold the items.
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/// </summary>
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public Panel MainPanel = null;
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/// <inheritdoc />
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public override void OnEndContainsFocus()
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{
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base.OnEndContainsFocus();
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// Dont lose focus when using panel. Does prevent LostFocus even from being called if clicking inside of the panel.
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if (MainPanel != null && MainPanel.IsMouseOver && !MainPanel.ContainsFocus)
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{
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MainPanel.Focus();
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return;
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}
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// Call event after this 'focus contains flag' propagation ends to prevent focus issues
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if (LostFocus != null)
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Scripting.RunOnUpdate(LostFocus);
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}
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private static DropdownLabel FindItem(Control control)
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{
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if (control is DropdownLabel item)
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return item;
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if (control is ContainerControl containerControl)
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{
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foreach (var child in containerControl.Children)
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{
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item = FindItem(child);
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if (item != null)
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return item;
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}
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}
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return null;
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}
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/// <inheritdoc />
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public override Control OnNavigate(NavDirection direction, Float2 location, Control caller, List<Control> visited)
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{
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if (IsFocused)
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{
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// Dropdown root is focused
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if (direction == NavDirection.Down)
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{
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// Pick the first item
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return FindItem(this);
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}
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// Close popup
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Defocus();
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return null;
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}
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return base.OnNavigate(direction, location, caller, visited);
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}
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/// <inheritdoc />
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public override void OnSubmit()
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{
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Defocus();
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base.OnSubmit();
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}
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/// <inheritdoc />
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public override bool OnKeyDown(KeyboardKeys key)
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{
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if (key == KeyboardKeys.Escape)
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{
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Defocus();
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return true;
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}
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return base.OnKeyDown(key);
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}
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/// <inheritdoc />
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public override bool OnMouseDown(Float2 location, MouseButton button)
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{
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if (base.OnMouseDown(location, button))
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return true;
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// Close on click outside the popup
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if (!new Rectangle(Float2.Zero, Size).Contains(ref location))
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{
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Defocus();
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return true;
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}
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return false;
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}
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/// <inheritdoc />
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public override bool OnTouchDown(Float2 location, int pointerId)
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{
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if (base.OnTouchDown(location, pointerId))
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return true;
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// Close on touch outside the popup
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if (!new Rectangle(Float2.Zero, Size).Contains(ref location))
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{
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Defocus();
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return true;
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}
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return false;
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}
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/// <inheritdoc />
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public override void OnDestroy()
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{
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LostFocus = null;
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MainPanel = null;
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SelectedControl = null;
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base.OnDestroy();
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}
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}
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[HideInEditor]
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private class DropdownLabel : Label
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{
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public Action<Label> ItemClicked;
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public override bool OnMouseDown(Float2 location, MouseButton button)
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{
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if (base.OnMouseDown(location, button))
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return true;
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ItemClicked?.Invoke(this);
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return true;
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}
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public override bool OnTouchDown(Float2 location, int pointerId)
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{
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if (base.OnTouchDown(location, pointerId))
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return true;
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ItemClicked?.Invoke(this);
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return true;
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}
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/// <inheritdoc />
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public override void OnSubmit()
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{
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ItemClicked?.Invoke(this);
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base.OnSubmit();
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}
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public override void OnDestroy()
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{
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ItemClicked = null;
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base.OnDestroy();
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}
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}
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/// <summary>
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/// The items.
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/// </summary>
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protected List<LocalizedString> _items = new List<LocalizedString>();
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/// <summary>
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/// The popup menu. May be null if has not been used yet.
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/// </summary>
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protected DropdownRoot _popup;
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private bool _touchDown;
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private bool _hadNavFocus;
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/// <summary>
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/// The selected index of the item (-1 for no selection).
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/// </summary>
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protected int _selectedIndex = -1;
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/// <summary>
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/// Gets or sets the items collection.
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/// </summary>
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[EditorOrder(1), Tooltip("The items collection.")]
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public List<LocalizedString> Items
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{
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get => _items;
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set => _items = value;
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}
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/// <summary>
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/// Gets or sets the selected item (returns <see cref="string.Empty"/> if no item is being selected).
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/// </summary>
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[HideInEditor, NoSerialize]
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public string SelectedItem
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{
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get => _selectedIndex != -1 ? _items[_selectedIndex].ToString() : string.Empty;
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set => SelectedIndex = _items.IndexOf(value);
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}
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/// <summary>
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/// Gets or sets the selected item (returns <see cref="LocalizedString.Empty"/> if no item is being selected).
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/// </summary>
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[HideInEditor, NoSerialize]
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public LocalizedString SelectedItemLocalized
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{
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get => _selectedIndex != -1 ? _items[_selectedIndex] : LocalizedString.Empty;
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set => SelectedIndex = _items.IndexOf(value);
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}
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/// <summary>
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/// Gets or sets the index of the selected.
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/// </summary>
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[EditorOrder(2), Limit(-1), Tooltip("The index of the selected item from the list.")]
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public int SelectedIndex
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{
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get => _selectedIndex;
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set
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{
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value = Mathf.Min(value, _items.Count - 1);
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if (value != _selectedIndex)
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{
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_selectedIndex = value;
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OnSelectedIndexChanged();
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}
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}
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}
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/// <summary>
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/// Gets or sets whether to show all of the items.
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/// </summary>
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[EditorOrder(3), Tooltip("Whether to show all of the items in the drop down.")]
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public bool ShowAllItems { get; set; } = true;
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/// <summary>
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/// Gets or sets the maximum number of items to show at once. Only used if ShowAllItems is false.
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/// </summary>
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[EditorOrder(4), VisibleIf(nameof(ShowAllItems), true), Limit(1), Tooltip("The number of items to show in the drop down.")]
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public int ShowMaxItemsCount { get; set; } = 5;
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/// <summary>
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/// Event fired when selected index gets changed.
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/// </summary>
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public event Action<Dropdown> SelectedIndexChanged;
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/// <summary>
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/// Gets a value indicating whether this popup menu is opened.
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/// </summary>
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public bool IsPopupOpened => _popup != null;
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/// <summary>
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/// Gets or sets the font used to draw text.
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/// </summary>
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[EditorDisplay("Text Style"), EditorOrder(2021)]
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public FontReference Font { get; set; }
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/// <summary>
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/// Gets or sets the custom material used to render the text. It must has domain set to GUI and have a public texture parameter named Font used to sample font atlas texture with font characters data.
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/// </summary>
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[EditorDisplay("Text Style"), EditorOrder(2022), Tooltip("Custom material used to render the text. It must has domain set to GUI and have a public texture parameter named Font used to sample font atlas texture with font characters data.")]
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public MaterialBase FontMaterial { get; set; }
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/// <summary>
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/// Gets or sets the color of the text.
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/// </summary>
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[EditorDisplay("Text Style"), EditorOrder(2020), ExpandGroups]
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public Color TextColor { get; set; }
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/// <summary>
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/// Gets or sets the color of the border.
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/// </summary>
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[EditorDisplay("Border Style"), EditorOrder(2010), ExpandGroups]
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public Color BorderColor { get; set; }
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/// <summary>
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/// Gets or sets the background color when dropdown popup is opened.
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/// </summary>
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[EditorDisplay("Background Style"), EditorOrder(2002)]
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public Color BackgroundColorSelected { get; set; }
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/// <summary>
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/// Gets or sets the border color when dropdown popup is opened.
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/// </summary>
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[EditorDisplay("Border Style"), EditorOrder(2012)]
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public Color BorderColorSelected { get; set; }
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/// <summary>
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/// Gets or sets the background color when dropdown is highlighted.
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/// </summary>
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[EditorDisplay("Background Style"), EditorOrder(2001), ExpandGroups]
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public Color BackgroundColorHighlighted { get; set; }
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/// <summary>
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/// Gets or sets the border color when dropdown is highlighted.
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/// </summary>
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[EditorDisplay("Border Style"), EditorOrder(2011)]
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public Color BorderColorHighlighted { get; set; }
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/// <summary>
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/// Gets or sets the image used to render dropdown drop arrow icon.
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/// </summary>
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[EditorDisplay("Icon Style"), EditorOrder(2033), Tooltip("The image used to render dropdown drop arrow icon.")]
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public IBrush ArrowImage { get; set; }
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/// <summary>
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/// Gets or sets the color used to render dropdown drop arrow icon.
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/// </summary>
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[EditorDisplay("Icon Style"), EditorOrder(2030), Tooltip("The color used to render dropdown drop arrow icon."), ExpandGroups]
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public Color ArrowColor { get; set; }
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/// <summary>
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/// Gets or sets the color used to render dropdown drop arrow icon (menu is opened).
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/// </summary>
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[EditorDisplay("Icon Style"), EditorOrder(2032), Tooltip("The color used to render dropdown drop arrow icon (menu is opened).")]
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public Color ArrowColorSelected { get; set; }
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/// <summary>
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/// Gets or sets the color used to render dropdown drop arrow icon (menu is highlighted).
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/// </summary>
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[EditorDisplay("Icon Style"), EditorOrder(2031), Tooltip("The color used to render dropdown drop arrow icon (menu is highlighted).")]
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public Color ArrowColorHighlighted { get; set; }
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/// <summary>
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/// Gets or sets the image used to render dropdown checked item icon.
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/// </summary>
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[EditorDisplay("Icon Style"), EditorOrder(2034), Tooltip("The image used to render dropdown checked item icon.")]
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public IBrush CheckedImage { get; set; }
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/// <summary>
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/// Initializes a new instance of the <see cref="Dropdown"/> class.
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/// </summary>
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public Dropdown()
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: base(0, 0, 120, 18.0f)
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{
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var style = Style.Current;
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Font = new FontReference(style.FontMedium);
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TextColor = style.Foreground;
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BackgroundColor = style.BackgroundNormal;
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BackgroundColorHighlighted = BackgroundColor;
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BackgroundColorSelected = BackgroundColor;
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BorderColor = style.BorderNormal;
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BorderColorHighlighted = style.BorderSelected;
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BorderColorSelected = BorderColorHighlighted;
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ArrowImage = new SpriteBrush(style.ArrowDown);
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ArrowColor = style.Foreground * 0.6f;
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ArrowColorSelected = style.BackgroundSelected;
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ArrowColorHighlighted = style.Foreground;
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CheckedImage = new SpriteBrush(style.CheckBoxTick);
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}
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/// <summary>
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/// Clears the items.
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/// </summary>
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public void ClearItems()
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{
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SelectedIndex = -1;
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_items.Clear();
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}
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/// <summary>
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/// Adds the item.
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/// </summary>
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/// <param name="item">The item.</param>
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public void AddItem(string item)
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{
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_items.Add(item);
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}
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/// <summary>
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/// Adds the items.
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/// </summary>
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/// <param name="items">The items.</param>
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public void AddItems(IEnumerable<string> items)
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{
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foreach (var item in items)
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_items.Add(item);
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}
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/// <summary>
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/// Sets the items.
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/// </summary>
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/// <param name="items">The items.</param>
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public void SetItems(IEnumerable<string> items)
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{
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SelectedIndex = -1;
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_items.Clear();
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foreach (var item in items)
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_items.Add(item);
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}
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/// <summary>
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/// Called when selected item index gets changed.
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/// </summary>
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protected virtual void OnSelectedIndexChanged()
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{
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SelectedIndexChanged?.Invoke(this);
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}
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/// <summary>
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/// Called when item is clicked.
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/// </summary>
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/// <param name="index">The index.</param>
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protected virtual void OnItemClicked(int index)
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{
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SelectedIndex = index;
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}
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/// <summary>
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/// Creates the popup menu (including items collection).
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/// </summary>
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protected virtual DropdownRoot CreatePopup()
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{
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// TODO: support using templates for the items collection container panel
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var popup = new DropdownRoot();
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// TODO: support item templates
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var panel = new Panel
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{
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AnchorPreset = AnchorPresets.StretchAll,
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BackgroundColor = BackgroundColor,
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ScrollBars = ScrollBars.Vertical,
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AutoFocus = true,
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Parent = popup,
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};
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popup.MainPanel = panel;
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var container = new VerticalPanel
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{
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AnchorPreset = AnchorPresets.StretchAll,
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BackgroundColor = Color.Transparent,
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IsScrollable = true,
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AutoSize = true,
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Parent = panel,
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};
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var border = new Border
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{
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BorderColor = BorderColorHighlighted,
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Width = 4.0f,
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AnchorPreset = AnchorPresets.StretchAll,
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Parent = popup,
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};
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var itemsHeight = 20.0f;
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var itemsMargin = 20.0f;
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// Scale height and margive with text height if needed
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var textHeight = Font.GetFont().Height;
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if (textHeight > itemsHeight)
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{
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itemsHeight = textHeight;
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itemsMargin = textHeight;
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}
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/*
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var itemsWidth = 40.0f;
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var font = Font.GetFont();
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for (int i = 0; i < _items.Count; i++)
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{
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itemsWidth = Mathf.Max(itemsWidth, itemsMargin + 4 + font.MeasureText(_items[i]).X);
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}
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*/
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var itemsWidth = Width;
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var height = container.Margin.Height;
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for (int i = 0; i < _items.Count; i++)
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{
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var item = new ContainerControl
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{
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AutoFocus = false,
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Height = itemsHeight,
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Width = itemsWidth,
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Parent = container,
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};
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var label = new DropdownLabel
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{
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AutoFocus = true,
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X = itemsMargin,
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Size = new Float2(itemsWidth - itemsMargin, itemsHeight),
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Font = Font,
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TextColor = Color.White * 0.9f,
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TextColorHighlighted = Color.White,
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HorizontalAlignment = TextAlignment.Near,
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Text = _items[i],
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Parent = item,
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Tag = i,
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};
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label.ItemClicked += c =>
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{
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OnItemClicked((int)c.Tag);
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DestroyPopup();
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};
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height += itemsHeight;
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if (i != 0)
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height += container.Spacing;
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if (_selectedIndex == i)
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{
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var icon = new Image
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{
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Brush = CheckedImage,
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Size = new Float2(itemsMargin, itemsHeight),
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Margin = new Margin(4.0f, 6.0f, 4.0f, 4.0f),
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//AnchorPreset = AnchorPresets.VerticalStretchLeft,
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Parent = item,
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};
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popup.SelectedControl = item;
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}
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}
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if (ShowAllItems || _items.Count < ShowMaxItemsCount)
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{
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popup.Size = new Float2(itemsWidth, height);
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panel.Size = popup.Size;
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}
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else
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{
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popup.Size = new Float2(itemsWidth, (itemsHeight + container.Spacing) * ShowMaxItemsCount);
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panel.Size = popup.Size;
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}
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return popup;
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}
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/// <summary>
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/// Called when popup menu gets shown.
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/// </summary>
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protected virtual void OnPopupShow()
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{
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}
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/// <summary>
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/// Called when popup menu gets hidden.
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/// </summary>
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protected virtual void OnPopupHide()
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{
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}
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/// <summary>
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/// Destroys the popup.
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/// </summary>
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protected virtual void DestroyPopup()
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{
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if (_popup != null)
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{
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OnPopupHide();
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_popup.EndMouseCapture();
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_popup.Dispose();
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_popup = null;
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if (_hadNavFocus)
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NavigationFocus();
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else
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Focus();
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}
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}
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/// <summary>
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/// Shows the popup.
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/// </summary>
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public void ShowPopup()
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{
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// Find canvas scalar and set as root if it exists.
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ContainerControl c = Parent;
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while(c.Parent != Root && c.Parent != null)
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{
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c = c.Parent;
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if (c is CanvasScaler scalar)
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break;
|
|
}
|
|
var root = c is CanvasScaler ? c : Root;
|
|
|
|
if (_items.Count == 0 || root == null)
|
|
return;
|
|
|
|
// Setup popup
|
|
DestroyPopup();
|
|
_hadNavFocus = IsNavFocused;
|
|
_popup = CreatePopup();
|
|
_popup.UnlockChildrenRecursive();
|
|
_popup.PerformLayout();
|
|
_popup.LostFocus += DestroyPopup;
|
|
|
|
// Show dropdown popup
|
|
var locationRootSpace = Location + new Float2(0, Height - Height * (1 - Scale.Y) / 2);
|
|
var parent = Parent;
|
|
while (parent != null && parent != root)
|
|
{
|
|
locationRootSpace = parent.PointToParent(ref locationRootSpace);
|
|
parent = parent.Parent;
|
|
}
|
|
_popup.Scale = Scale;
|
|
_popup.Location = locationRootSpace - new Float2(0, _popup.Height * (1 - _popup.Scale.Y) / 2);
|
|
_popup.Parent = root;
|
|
_popup.Focus();
|
|
_popup.StartMouseCapture();
|
|
if (_popup.SelectedControl != null && _popup.MainPanel != null)
|
|
_popup.MainPanel.ScrollViewTo(_popup.SelectedControl, true);
|
|
OnPopupShow();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Hides the popup.
|
|
/// </summary>
|
|
public void HidePopup()
|
|
{
|
|
DestroyPopup();
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void OnDestroy()
|
|
{
|
|
DestroyPopup();
|
|
|
|
base.OnDestroy();
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void DrawSelf()
|
|
{
|
|
// Cache data
|
|
var clientRect = new Rectangle(Float2.Zero, Size);
|
|
float margin = clientRect.Height * 0.2f;
|
|
float boxSize = clientRect.Height - margin * 2;
|
|
bool isOpened = IsPopupOpened;
|
|
bool enabled = EnabledInHierarchy;
|
|
Color backgroundColor = BackgroundColor;
|
|
Color borderColor = BorderColor;
|
|
Color arrowColor = ArrowColor;
|
|
if (!enabled)
|
|
{
|
|
backgroundColor *= 0.5f;
|
|
arrowColor *= 0.7f;
|
|
}
|
|
else if (isOpened || _touchDown)
|
|
{
|
|
backgroundColor = BackgroundColorSelected;
|
|
borderColor = BorderColorSelected;
|
|
arrowColor = ArrowColorSelected;
|
|
}
|
|
else if (IsMouseOver || IsNavFocused)
|
|
{
|
|
backgroundColor = BackgroundColorHighlighted;
|
|
borderColor = BorderColorHighlighted;
|
|
arrowColor = ArrowColorHighlighted;
|
|
}
|
|
|
|
// Background
|
|
Render2D.FillRectangle(clientRect, backgroundColor);
|
|
Render2D.DrawRectangle(clientRect, borderColor);
|
|
|
|
// Check if has selected item
|
|
if (_selectedIndex > -1 && _selectedIndex < _items.Count)
|
|
{
|
|
// Draw text of the selected item
|
|
var textRect = new Rectangle(margin, 0, clientRect.Width - boxSize - 2.0f * margin, clientRect.Height);
|
|
Render2D.PushClip(textRect);
|
|
var textColor = TextColor;
|
|
Render2D.DrawText(Font.GetFont(), FontMaterial, _items[_selectedIndex], textRect, enabled ? textColor : textColor * 0.5f, TextAlignment.Near, TextAlignment.Center);
|
|
Render2D.PopClip();
|
|
}
|
|
|
|
// Arrow
|
|
ArrowImage?.Draw(new Rectangle(clientRect.Width - margin - boxSize, margin, boxSize, boxSize), arrowColor);
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void OnLostFocus()
|
|
{
|
|
_touchDown = false;
|
|
|
|
base.OnLostFocus();
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void OnMouseLeave()
|
|
{
|
|
_touchDown = false;
|
|
|
|
base.OnMouseLeave();
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override bool OnMouseDown(Float2 location, MouseButton button)
|
|
{
|
|
if (base.OnMouseDown(location, button))
|
|
return true;
|
|
|
|
if (button == MouseButton.Left)
|
|
{
|
|
_touchDown = true;
|
|
if (!IsPopupOpened)
|
|
Focus();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override bool OnMouseUp(Float2 location, MouseButton button)
|
|
{
|
|
if (base.OnMouseUp(location, button))
|
|
return true;
|
|
|
|
if (_touchDown && button == MouseButton.Left)
|
|
{
|
|
_touchDown = false;
|
|
ShowPopup();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override bool OnMouseDoubleClick(Float2 location, MouseButton button)
|
|
{
|
|
if (base.OnMouseDoubleClick(location, button))
|
|
return true;
|
|
|
|
if (_touchDown && button == MouseButton.Left)
|
|
{
|
|
_touchDown = false;
|
|
ShowPopup();
|
|
return true;
|
|
}
|
|
|
|
if (button == MouseButton.Left)
|
|
{
|
|
_touchDown = true;
|
|
if (!IsPopupOpened)
|
|
Focus();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override bool OnTouchDown(Float2 location, int pointerId)
|
|
{
|
|
if (base.OnTouchDown(location, pointerId))
|
|
return true;
|
|
|
|
_touchDown = true;
|
|
return true;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override bool OnTouchUp(Float2 location, int pointerId)
|
|
{
|
|
if (base.OnTouchUp(location, pointerId))
|
|
return true;
|
|
|
|
if (_touchDown)
|
|
{
|
|
ShowPopup();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void OnTouchLeave(int pointerId)
|
|
{
|
|
_touchDown = false;
|
|
|
|
base.OnTouchLeave(pointerId);
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public override void OnSubmit()
|
|
{
|
|
ShowPopup();
|
|
|
|
base.OnSubmit();
|
|
}
|
|
}
|
|
}
|