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我想在c＃winforms應用程序中禁用ToolStripSplitButton的按鈕部分。據我所知，這是不可能的，我想避免一個複雜的解決方案（重寫整個toolstripsplitbutton），所以我試圖至少禁用視覺，即。當按鈕部分禁用時繪製灰色圖標。如何禁用部分ToolStripSplitButton
首先我瀏覽referencesource發現的ToolStripRenderer和ToolStripProfessionalRenderer使用一些「內部」的屬性和方法在OnRenderItemImage（ToolStripItemImageRenderEventArgs E），所以我不能模仿（複製和修改-A位）OnRenderItemImage的行爲。
接下來我嘗試了下面的代碼。 基本上它的工作原理是，當標籤爲boolean false時，toolStripSplitButton1灰顯。 但是這個解決方案以某種方式殺死了我所有的System.Windows.Forms.Timer！試試這個代碼，當toolStripSplitButton1.Tag == false時，獨立於工具條的timer1不再勾選。而toolStripSplitButton1工具提示不會顯示出來（猜測是因爲它也使用Timer）。 （button1和button1_Click僅用於切換toolStripSplitButton1.Tag）
我的第一個問題是爲什麼OnRenderItemImage會殺死所有System.Windows.Forms.Timer？
第二個問題是如何實現原來的目標，灰色按鈕圖標至少在視覺上與按鈕本身無關？
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
toolStrip1.Renderer = new MyToolStripProfessionalRenderer();
toolStripSplitButton1.Tag = false; // this is for disabling button part
toolStripSplitButton1.ToolTipText = "toolStripSplitButton1 ToolTip";
System.Windows.Forms.Timer timer1 = new Timer();
timer1.Interval = 1000;
timer1.Tick += T_Tick;
timer1.Start();
}
int ticks = 0;
private void T_Tick(object sender, EventArgs e)
{
System.Diagnostics.Debug.WriteLine(ticks++);
}
private void button1_Click(object sender, EventArgs e)
{
toolStripSplitButton1.Tag = !((bool)toolStripSplitButton1.Tag);
}
}
class MyToolStripProfessionalRenderer : ToolStripProfessionalRenderer
{
protected override void OnRenderItemImage(ToolStripItemImageRenderEventArgs e)
{
try
{
if (e.Item.Enabled &&
e.Item.Tag?.GetType() == typeof(bool) &&
!(bool)e.Item.Tag)
{
e.Item.Enabled = false;
base.OnRenderItemImage(e);
e.Item.Enabled = true;
}
else
base.OnRenderItemImage(e);
}
catch (Exception ex)
{
// this never reached, there's no exceptions
System.Diagnostics.Debug.WriteLine(ex);
}
}
}
}
Designer.cs：
namespace WindowsFormsApplication
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
this.toolStrip1 = new System.Windows.Forms.ToolStrip();
this.toolStripSplitButton1 = new System.Windows.Forms.ToolStripSplitButton();
this.button1 = new System.Windows.Forms.Button();
this.toolStrip1.SuspendLayout();
this.SuspendLayout();
//
// toolStrip1
//
this.toolStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
this.toolStripSplitButton1});
this.toolStrip1.Location = new System.Drawing.Point(0, 0);
this.toolStrip1.Name = "toolStrip1";
this.toolStrip1.Size = new System.Drawing.Size(352, 25);
this.toolStrip1.TabIndex = 0;
this.toolStrip1.Text = "toolStrip1";
//
// toolStripSplitButton1
//
this.toolStripSplitButton1.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Image;
this.toolStripSplitButton1.Image = ((System.Drawing.Image)(resources.GetObject("toolStripSplitButton1.Image")));
this.toolStripSplitButton1.ImageTransparentColor = System.Drawing.Color.Magenta;
this.toolStripSplitButton1.Name = "toolStripSplitButton1";
this.toolStripSplitButton1.Size = new System.Drawing.Size(32, 22);
this.toolStripSplitButton1.Text = "toolStripSplitButton1";
//
// button1
//
this.button1.Location = new System.Drawing.Point(13, 64);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(352, 265);
this.Controls.Add(this.button1);
this.Controls.Add(this.toolStrip1);
this.Name = "Form1";
this.Text = "Form1";
this.toolStrip1.ResumeLayout(false);
this.toolStrip1.PerformLayout();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.ToolStrip toolStrip1;
private System.Windows.Forms.ToolStripSplitButton toolStripSplitButton1;
private System.Windows.Forms.Button button1;
}
}
你的目標是？什麼是'SplitButton'的按鈕部分的用法被禁用，但用戶可以從它的下拉列表中選擇一個項目？ –
這是一個組合保存按鈕。按下按鈕部分不會「正常」保存。當數據沒有變化時應該禁用它。下拉部分包含「另存爲」和「僅保存修改」（這在我的應用程序的上下文中是有意義的），並且它們應該始終可以訪問。 （我知道，我的菜單結構的組建可以組織不同，以避免部分禁用按鈕的需要，但我正在尋找一種方法來做到這一點。）一般來說，我不明白爲什麼.NET使用'內部'的東西在一個可重寫的方法... – Feri
你必須小心你在塗料事件中做什麼。做任何導致paint事件再次被觸發的事情都會讓你的UI線程燒掉100％的核心。似乎工作得很好，除了冷卻風扇的咆哮淹沒思考的能力，但是，定時器停止滴答。你不能像這樣混淆Enabled屬性，改變它會再次觸發paint事件。 –