// COPYRIGHT (C) Tom. ALL RIGHTS RESERVED.
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// THE AntdUI PROJECT IS AN WINFORM LIBRARY LICENSED UNDER THE Apache-2.0 License.
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// LICENSED UNDER THE Apache License, VERSION 2.0 (THE "License")
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// YOU MAY NOT USE THIS FILE EXCEPT IN COMPLIANCE WITH THE License.
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// YOU MAY OBTAIN A COPY OF THE LICENSE AT
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING, SOFTWARE
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// DISTRIBUTED UNDER THE LICENSE IS DISTRIBUTED ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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// SEE THE LICENSE FOR THE SPECIFIC LANGUAGE GOVERNING PERMISSIONS AND
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// LIMITATIONS UNDER THE License.
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// GITEE: https://gitee.com/antdui/AntdUI
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// GITHUB: https://github.com/AntdUI/AntdUI
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// CSDN: https://blog.csdn.net/v_132
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// QQ: 17379620
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Drawing.Design;
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using System.Windows.Forms;
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namespace AntdUI
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{
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/// <summary>
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/// Dropdown 选择器
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/// </summary>
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/// <remarks>向下弹出的列表。</remarks>
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[Description("Dropdown 下拉菜单")]
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[ToolboxItem(true)]
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[DefaultEvent("SelectedValueChanged")]
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public class Dropdown : Button, SubLayeredForm
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{
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#region 属性
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/// <summary>
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/// 列表自动宽度
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/// </summary>
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[Description("列表自动宽度"), Category("行为"), DefaultValue(true)]
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public bool ListAutoWidth { get; set; } = true;
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/// <summary>
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/// 触发下拉的行为
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/// </summary>
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[Description("触发下拉的行为"), Category("行为"), DefaultValue(Trigger.Click)]
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public Trigger Trigger { get; set; } = Trigger.Click;
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/// <summary>
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/// 菜单弹出位置
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/// </summary>
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[Description("菜单弹出位置"), Category("行为"), DefaultValue(TAlignFrom.BL)]
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public TAlignFrom Placement { get; set; } = TAlignFrom.BL;
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/// <summary>
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/// 列表最多显示条数
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/// </summary>
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[Description("列表最多显示条数"), Category("行为"), DefaultValue(4)]
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public int MaxCount { get; set; } = 4;
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/// <summary>
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/// 下拉箭头是否显示
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/// </summary>
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[Description("下拉箭头是否显示"), Category("外观"), DefaultValue(false)]
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public bool DropDownArrow { get; set; } = false;
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/// <summary>
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/// 点击到最里层（无节点才能点击）
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/// </summary>
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[Description("点击到最里层（无节点才能点击）"), Category("行为"), DefaultValue(false)]
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public bool ClickEnd { get; set; } = false;
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#region 数据
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BaseCollection? items;
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/// <summary>
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/// 数据
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/// </summary>
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
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[Editor("System.Windows.Forms.Design.ListControlStringCollectionEditor", typeof(UITypeEditor))]
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[Description("集合"), Category("数据")]
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public BaseCollection Items
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{
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get
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{
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items ??= new BaseCollection();
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return items;
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}
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set => items = value;
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}
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/// <summary>
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/// SelectedValue 属性值更改时发生
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/// </summary>
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[Description("SelectedValue 属性值更改时发生"), Category("行为")]
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public event ObjectNEventHandler? SelectedValueChanged = null;
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internal void DropDownChange(object value)
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{
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SelectedValueChanged?.Invoke(this, new ObjectNEventArgs(value));
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select_x = 0;
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subForm = null;
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}
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#endregion
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#endregion
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#region 动画
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LayeredFormSelectDown? subForm = null;
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public ILayeredForm? SubForm() => subForm;
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ITask? ThreadExpand = null;
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bool expand = false;
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bool Expand
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{
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get => expand;
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set
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{
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if (expand == value) return;
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expand = value;
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if (ShowArrow && Config.Animation)
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{
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ThreadExpand?.Dispose();
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var t = Animation.TotalFrames(10, 100);
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if (value)
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{
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ThreadExpand = new ITask((i) =>
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{
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ArrowProg = Animation.Animate(i, t, 2F, AnimationType.Ball) - 1F;
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Invalidate();
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return true;
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}, 10, t, () =>
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{
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ArrowProg = 1;
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Invalidate();
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});
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}
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else
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{
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ThreadExpand = new ITask((i) =>
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{
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ArrowProg = -(Animation.Animate(i, t, 2F, AnimationType.Ball) - 1F);
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Invalidate();
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return true;
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}, 10, t, () =>
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{
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ArrowProg = -1;
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Invalidate();
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});
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}
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}
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else ArrowProg = value ? 1F : -1F;
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}
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}
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#endregion
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#region 鼠标
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protected override void OnMouseClick(MouseEventArgs e)
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{
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if (Trigger == Trigger.Click)
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{
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ClickDown();
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return;
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}
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base.OnMouseClick(e);
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}
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protected override void OnMouseEnter(EventArgs e)
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{
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if (Trigger == Trigger.Hover && subForm == null) ClickDown();
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base.OnMouseEnter(e);
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}
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protected override void OnLostFocus(EventArgs e)
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{
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subForm?.IClose();
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base.OnLostFocus(e);
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}
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internal int select_x = 0;
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void ClickDown()
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{
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if (items != null && items.Count > 0)
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{
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if (subForm == null)
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{
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var objs = new List<object>(items.Count);
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foreach (var it in items)
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{
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objs.Add(it);
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}
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Expand = true;
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subForm = new LayeredFormSelectDown(this, Radius, objs);
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subForm.Disposed += (a, b) =>
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{
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select_x = 0;
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subForm = null;
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Expand = false;
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};
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subForm.Show(this);
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}
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else subForm?.IClose();
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}
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else subForm?.IClose();
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}
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#endregion
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}
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}
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