我正在.NET 上使用 Windows.Forms 开发简单的 C# 应用程序。我需要一些按钮来显示带有子类别的下拉菜单 - 很像 ToolStripMenu，但是按钮，你知道的。我搜索了它，但找不到任何变体。
我的问题是：有没有办法做到这一点，也许是一些允许附加菜单的秘密按钮属性？
任何帮助将不胜感激。
问问题
72388 次
10 回答
71
按钮右侧有向下箭头，您可以从设计器设置它的菜单：
使用 ShowMenuUnderCursor：
菜单按钮类：
public class MenuButton : Button
{
[DefaultValue(null)]
public ContextMenuStrip Menu { get; set; }
[DefaultValue(false)]
public bool ShowMenuUnderCursor { get; set; }
protected override void OnMouseDown(MouseEventArgs mevent)
{
base.OnMouseDown(mevent);
if (Menu != null && mevent.Button == MouseButtons.Left)
{
Point menuLocation;
if (ShowMenuUnderCursor)
{
menuLocation = mevent.Location;
}
else
{
menuLocation = new Point(0, Height);
}
Menu.Show(this, menuLocation);
}
}
protected override void OnPaint(PaintEventArgs pevent)
{
base.OnPaint(pevent);
if (Menu != null)
{
int arrowX = ClientRectangle.Width - 14;
int arrowY = ClientRectangle.Height / 2 - 1;
Brush brush = Enabled ? SystemBrushes.ControlText : SystemBrushes.ControlDark;
Point[] arrows = new Point[] { new Point(arrowX, arrowY), new Point(arrowX + 7, arrowY), new Point(arrowX + 3, arrowY + 4) };
pevent.Graphics.FillPolygon(brush, arrows);
}
}
}
于 2014-06-06T17:48:18.193 回答
51
您可以在单击事件上显示 ContextMenuStrip：
private void button1_Click(object sender, EventArgs e) {
contextMenuStrip1.Show(button1, new Point(0, button1.Height));
}
要自行决定是在按钮上方还是下方显示菜单，您可以尝试使用以下代码，该代码测量菜单并确定它是否会部分显示在屏幕外：
private void button1_Click(object sender, EventArgs e) {
Point screenPoint = button1.PointToScreen(new Point(button1.Left, button1.Bottom));
if (screenPoint.Y + contextMenuStrip1.Size.Height > Screen.PrimaryScreen.WorkingArea.Height) {
contextMenuStrip1.Show(button1, new Point(0, -contextMenuStrip1.Size.Height));
} else {
contextMenuStrip1.Show(button1, new Point(0, button1.Height));
}
}
于 2012-05-29T16:42:39.383 回答
25
稍微扩展@Jaex 答案以允许分隔线、箭头的条件绘制（如果未配置任何内容）以及主按钮主体和菜单箭头的单独单击事件。
应该注意的是，为了更好地对齐，您可以设置button.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
这是我的小改进
public class SplitButton : Button
{
[DefaultValue(null), Browsable(true),
DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public ContextMenuStrip Menu { get; set; }
[DefaultValue(20), Browsable(true),
DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public int SplitWidth { get; set; }
public SplitButton()
{
SplitWidth = 20;
}
protected override void OnMouseDown(MouseEventArgs mevent)
{
var splitRect = new Rectangle(this.Width - this.SplitWidth, 0, this.SplitWidth, this.Height);
// Figure out if the button click was on the button itself or the menu split
if (Menu != null &&
mevent.Button == MouseButtons.Left &&
splitRect.Contains(mevent.Location) )
{
Menu.Show(this, 0, this.Height); // Shows menu under button
//Menu.Show(this, mevent.Location); // Shows menu at click location
}
else
{
base.OnMouseDown(mevent);
}
}
protected override void OnPaint(PaintEventArgs pevent)
{
base.OnPaint(pevent);
if (this.Menu != null && this.SplitWidth > 0)
{
// Draw the arrow glyph on the right side of the button
int arrowX = ClientRectangle.Width - 14;
int arrowY = ClientRectangle.Height / 2 - 1;
var arrowBrush = Enabled ? SystemBrushes.ControlText : SystemBrushes.ButtonShadow;
var arrows = new[] { new Point(arrowX, arrowY), new Point(arrowX + 7, arrowY), new Point(arrowX + 3, arrowY + 4) };
pevent.Graphics.FillPolygon(arrowBrush, arrows);
// Draw a dashed separator on the left of the arrow
int lineX = ClientRectangle.Width - this.SplitWidth;
int lineYFrom = arrowY - 4;
int lineYTo = arrowY + 8;
using( var separatorPen = new Pen(Brushes.DarkGray){DashStyle = DashStyle.Dot})
{
pevent.Graphics.DrawLine(separatorPen, lineX, lineYFrom, lineX, lineYTo);
}
}
}
}
于 2014-11-27T14:56:45.917 回答
8
最简单的选择是在仅显示单个按钮的未停靠 ToolStrip 中使用 ToolStripDropDownButton。然后您可以向其中添加子项目等。为此： - 将工具条拖到您的控件/表单上 - 使用布局助手添加 DropDownButton - 将 GripStyle 设置为 Hidden - 将 Dock 设置为 None
结果是一个独立的工具栏样式按钮，它支持您描述的下拉行为。
于 2012-05-29T16:42:33.097 回答
7
很容易我们可以做到。这可能会有所帮助:)
ContextMenuStrip contextMenuStrip1 = new ContextMenuStrip();
private void button1_Click(object sender, EventArgs e)
{
contextMenuStrip1.Items.Clear();
contextMenuStrip1.Items.Add("item1");
contextMenuStrip1.Items.Add("item2");
contextMenuStrip1.Show(button1, new Point(0, button1.Height));
}
private void contextMenuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
if (e.ClickedItem.Text == "item1")
{
MessageBox.Show(e.ClickedItem.Text);
}
}
于 2014-06-07T19:41:48.013 回答
3
上面 Jaex 的 MenuButton 类对我来说是完美的。我确实将下面的逻辑添加到 OnMouseDown 中，以便只有在我单击箭头时才会显示上下文菜单。如果我单击较大的部分，则会触发正常的单击事件。允许“默认”单击操作。
if (Menu != null && mevent.Button == MouseButtons.Left)
{
if (mevent.Location.X >= this.Width - 14)
{
System.Drawing.Point menuLocation;
if (ShowMenuUnderCursor)
{
menuLocation = mevent.Location;
}
else
{
menuLocation = new System.Drawing.Point(0, Height);
}
Menu.Show(this, menuLocation);
}
}
认为这可能对某人有用。谢谢贾克斯
于 2016-05-14T04:49:42.240 回答
2
单击时在按钮下方显示上下文菜单。
于 2012-05-29T16:36:28.293 回答
0
Infragistics 有 WinDropDownButton：http ://help.infragistics.com/Help/NetAdvantage/WinForms/2012.1/CLR2.0/html/WinDropDownButton_About_WinDropDownButton.html
所以它肯定存在，但是您可能不是在寻找付费的第三方控件。
于 2012-05-29T17:07:15.273 回答
0
我也在摆弄这个问题，并找到了一个非常简单的解决方案（尽管有点肮脏）：在ComboBox下放置 a Button，这样它就会在按钮旁边显示下拉箭头。
然后使用SelectedIndexChanged来ComboBox改变Button行为，或者立即执行您希望它执行的操作。
于 2017-04-12T15:16:40.947 回答
0
所以我想出了一个基于工具条的自定义控件，因此可以完全自定义文本和图像，每个按钮/动作都有自己的点击事件。并且可以在winform编辑器中设计。有一些小的布局问题，例如下拉项的对齐方式，但没有什么严重的问题。该按钮将使单击过的放置项目成为主要项目，这可以在OnActions_DropDownItemClicked()方法中更改
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//System.Windows.Forms.Design.ControlDesigner
namespace YourNamespace
{
/// <summary>
/// Implements a drop button using only standard winform controls
/// </summary>
[DesignerSerializer("System.Windows.Forms.Design.ToolStripCodeDomSerializer, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
[Designer("System.Windows.Forms.Design.ControlDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class DropButton : ToolStrip
{
#region Private Fields
private List<ActionButtonInfo> _actionButtons = new List<ActionButtonInfo>();
private ToolStripLayoutStyle _layoutStyle = ToolStripLayoutStyle.Flow;
private int _splitButtonWidth = 30;
private System.Windows.Forms.ToolStripDropDownButton btnActions;
private System.Windows.Forms.ToolStripButton btnMainAction;
#endregion Private Fields
#region Public Properties
/// <summary>
/// Gets or sets the action buttons.
/// </summary>
public List<ActionButtonInfo> ActionButtons
{
get
{
return this._actionButtons;
}
set
{
this._actionButtons = value;
SetupActionButtons();
}
}
/// <summary>
/// Gets or sets the drop down direction.
/// </summary>
public ToolStripDropDownDirection DropDownDirection
{
get; set;
}
/// <inheritdoc/>
[Browsable(false)]
public new ToolStripGripStyle GripStyle => ToolStripGripStyle.Hidden;
/// <inheritdoc/>
[Browsable(false)]
public new ToolStripItemCollection Items
{
get
{
return base.Items;
}
}
/// <inheritdoc/>
[Browsable(false)]
public new ToolStripLayoutStyle LayoutStyle => _layoutStyle;
public new ToolStripLayoutStyle LayoutStyle1 => ToolStripLayoutStyle.Flow;
/// <summary>
/// Gets or sets the split button width.
/// </summary>
public int SplitButtonWidth
{
get
{
return _splitButtonWidth;
}
set
{
if(value < 10 || value > this.Width)
{
throw new ArgumentOutOfRangeException();
}
_splitButtonWidth = value;
ResizeButtons();
}
}
#endregion Public Properties
#region Private Methods
/// <summary>
/// The actual implementation that adds a button to the button list
/// </summary>
/// <param name="abi">The abi.</param>
private void AddActionButtonImpl(ActionButtonInfo abi)
{
ToolStripItem tsi = new ToolStripButton
{
AutoSize = false,
Text = abi.Text,
Image = abi.Image,
Tag = abi,
Height = btnMainAction.Height,
Width = btnMainAction.Width + btnActions.Width,
TextImageRelation = TextImageRelation.ImageBeforeText,
TextAlign = ContentAlignment.MiddleLeft,
Padding = new System.Windows.Forms.Padding(2, 2, 2, 2)
};
btnActions.DropDownItems.Add(tsi);
}
private void OnActions_DropDownItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
if(e.ClickedItem != null && !String.IsNullOrEmpty(e.ClickedItem.Text))
{
ActionButtonInfo abi = e.ClickedItem.Tag as ActionButtonInfo;
if(abi != null)
{
SetMainButton(abi);
abi.Clicked?.Invoke(this, null);
}
}
}
private void OnbtnActions_DropDownOpening(object sender, EventArgs e)
{
ToolStripDropDownMenu tdd = btnActions.DropDown as ToolStripDropDownMenu;
tdd.DefaultDropDownDirection = ToolStripDropDownDirection.BelowLeft;
tdd.ShowCheckMargin = false;
tdd.ShowImageMargin = false;
tdd.MinimumSize = btnMainAction.Size;
}
/// <summary>
/// Resizes the buttons.
/// </summary>
/// <param name="suspend">If true, suspend.</param>
private void ResizeButtons(bool suspend = true)
{
if(btnActions is null || btnMainAction is null)
return;
if(suspend)
this.SuspendLayout();
int marginX = (this.Margin.Left + this.Margin.Right);
int marginY = (this.Margin.Top + this.Margin.Bottom);
btnMainAction.Width = this.Width - _splitButtonWidth - marginX;
btnActions.Width = _splitButtonWidth - marginX - 1;
btnMainAction.Height = this.Height - marginY;
btnActions.Height = this.Height - marginY;
if(suspend)
this.ResumeLayout(true);
}
/// <summary>
/// Sets the main button.
/// </summary>
/// <param name="abi">The abi.</param>
private void SetMainButton(ActionButtonInfo abi)
{
btnMainAction.Image = abi.Image;
btnMainAction.Text = abi.Text;
// btnMainAction.Click += abi.Clicked;
btnMainAction.Tag = abi;
}
/// <summary>
/// Setups the action buttons.
/// </summary>
private void SetupActionButtons()
{
if(_actionButtons.Count == 0)
{
btnActions.Enabled = false;
return;
}
btnActions.Enabled = true;
SetMainButton(_actionButtons[0]);
foreach(ActionButtonInfo abi in _actionButtons)
{
AddActionButtonImpl(abi);
}
btnActions.DropDownOpening += OnbtnActions_DropDownOpening;
}
#endregion Private Methods
#region Protected Methods
/// <inheritdoc/>
protected override void OnCreateControl()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(DropButton));
base.OnCreateControl();
this.btnMainAction = new System.Windows.Forms.ToolStripButton();
this.btnActions = new System.Windows.Forms.ToolStripDropDownButton();
this.SuspendLayout();
this.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
this.btnMainAction,
this.btnActions});
this.MinimumSize = new Size(100, 40);
base.GripStyle = System.Windows.Forms.ToolStripGripStyle.Hidden;
base.LayoutStyle = System.Windows.Forms.ToolStripLayoutStyle.Flow;
this.AutoSize = false;
this.Dock = DockStyle.None;
// this.ItemClicked += new System.Windows.Forms.ToolStripItemClickedEventHandler(this.toolStripAction_ItemClicked);
//
// btnMainAction
//
this.btnMainAction.AutoSize = false;
this.btnMainAction.BackColor = System.Drawing.Color.Gainsboro;
this.btnMainAction.ForeColor = System.Drawing.Color.Black;
this.btnMainAction.Font = new System.Drawing.Font("Segoe UI", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
this.btnMainAction.ImageScaling = System.Windows.Forms.ToolStripItemImageScaling.None;
this.btnMainAction.ImageTransparentColor = System.Drawing.Color.Magenta;
this.btnMainAction.Name = "btnMainAction";
this.btnMainAction.Size = new System.Drawing.Size(this.Width, this.Height);
this.btnMainAction.Text = "Test";
//
// btnActions
//
this.btnActions.AutoSize = false;
this.btnActions.AutoToolTip = false;
this.btnActions.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
this.btnActions.BackColor = System.Drawing.Color.Gainsboro;
this.btnActions.ForeColor = System.Drawing.Color.Black;
this.btnActions.Font = new System.Drawing.Font("Segoe UI", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point);
this.btnActions.Image = Properties.Resources.DropButtonArrow;
this.btnActions.ImageScaling = System.Windows.Forms.ToolStripItemImageScaling.None;
this.btnActions.Name = "btnActions";
this.btnActions.ShowDropDownArrow = false;
this.btnActions.Size = new System.Drawing.Size(_splitButtonWidth, this.Height);
this.btnActions.TextImageRelation = System.Windows.Forms.TextImageRelation.Overlay;
btnActions.DropDownDirection = ToolStripDropDownDirection.BelowLeft;
btnActions.DropDownItemClicked += OnActions_DropDownItemClicked;
ResizeButtons(false);
this.ResumeLayout(false);
this.PerformLayout();
}
/// <summary>
/// Propagate font changes to the child controls
/// </summary>
/// <param name="e"></param>
protected override void OnFontChanged(EventArgs e)
{
base.OnFontChanged(e);
if(btnActions is null || btnMainAction is null)
return;
btnMainAction.Font = this.Font;
btnActions.Font = this.Font;
}
/// <inheritdoc/>
protected override void OnLayout(LayoutEventArgs e)
{
ResizeButtons(false);
base.OnLayout(e);
}
#endregion Protected Methods
#region Public Methods
/// <summary>
/// Adds an action button.
/// </summary>
/// <param name="actionButtonInfo">The action button info.</param>
public void AddActionButton(ActionButtonInfo actionButtonInfo)
{
_actionButtons.Add(actionButtonInfo);
if(_actionButtons.Count == 1)
SetupActionButtons();
else
AddActionButtonImpl(actionButtonInfo);
}
#endregion Public Methods
}
}
于 2021-02-03T10:38:24.463 回答