Question

我想在c＃winforms应用中禁用ToolStripSplitButton的按钮部分。据我所知，这是不可能的，我想避免一个复杂的解决方案（重写整个toolstripsplitbutton），所以我试图至少在视觉上禁用，即。按钮部分禁用时绘制灰色图标。

首先，我浏览了referencesource，发现ToolStripRenderer和ToolStripProfessionalRenderer在OnRenderItemImage（ToolStripItemImageRenderEventArgs e）中使用了一些“内部”属性和方法，因此我无法模仿（复制和修改一位）OnRenderItemImage的行为。

接下来我尝试了以下代码。基本上它可以工作，当Tag为布尔值false时，toolStripSplitButton1会变灰。但是这个解决方案以某种方式杀死了我所有的System.Windows.Forms.Timer！尝试此代码，当toolStripSplitButton1.Tag == false时，独立于工具条的timer1不再打勾。并且toolStripSplitButton1工具提示没有显示（猜测因为它也使用了Timer）。（button1和button1_Click仅用于切换toolStripSplitButton1.Tag）

我的第一个问题是为什么OnRenderItemImage会杀死所有System.Windows.Forms.Timer？

第二个问题是如何实现原始目标，至少在视觉上独立于按钮本身灰显按钮图标？

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;
    }
}

Answer 1

我不认为使用计时器来跟踪变化是一个好主意。我建议创建一个changeOccurred事件并在事件中执行操作。

如何禁用部件ToolStripSplitButton

1 个答案: