我在ToolStripMenuItem上设置了一个BackgroundImage,它是ContextMenuItem的一部分。
当我将鼠标悬停在它上面时,背景图像会消失。蓝色的“突出显示”框出现在它上面(至少我认为这是正在发生的事情)。
当鼠标悬停在背景图像上时,如何显示背景图像?
我尝试在MouseEnter事件中设置图像,但没有运气。
答案 0 :(得分:3)
创建一个派生自ToolStripProfessionalRenderer的类
public class customRenderer : ToolStripProfessionalRenderer
{
protected override void OnRenderButtonBackground(ToolStripItemRenderEventArgs e)
{
// check if the object being rendered is actually a ToolStripButton
if (e.Item is ToolStripButton)
{
ToolStripButton button = e.Item as ToolStripButton;
// only render checked items differently
if (button.Checked || button.Selected)
{
//do work here
}
else
base.OnRenderButtonBackground(e);
}
// if this object is not a ToolStripButton, use the normal render event
else
base.OnRenderButtonBackground(e);
}
protected override void OnRenderItemBackground(ToolStripItemRenderEventArgs e)
{
//do checking here like above
base.OnRenderItemBackground(e);
}
}
设置表单构造函数上的控件的renderes - 适用于toolstrip(toolstrippbackground,toolstripbutton,contexmenustrip等)的所有控件 我刚刚覆盖了OnRenderButtonBackground因为你提到这个,你可以覆盖ToolStripProfessionalRenderer的其他方法
toolStrip1.Renderer = new customRenderer();//if you have this and want to override any behaviour
menuStrip1.Renderer = new customRenderer();//if you have this and want to override any behaviour
contextMenuStrip1.Renderer = new customRenderer();//if you have this and want to override any behaviour
答案 1 :(得分:2)
为此,您需要使用自定义渲染器。
contextMenuStrip1.Renderer = new BackgroundImageRenderer();
根据需要自定义变量。
private class BackgroundImageRenderer : ToolStripProfessionalRenderer
{
protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
{
if (!e.Item.Selected)
{
base.OnRenderMenuItemBackground(e);
}
else
{
if (e.Item.Name == "theNameOfMyToolStripMenuItem")
{
Image backgroundImage = global::YourProject.Properties.Resources.ImageFileName;
e.Graphics.DrawImage(backgroundImage, 0, 0, e.Item.Width, e.Item.Height);
}
else {
base.OnRenderMenuItemBackground(e);
}
}
}
}
答案 2 :(得分:0)
public class customRenderer : ToolStripProfessionalRenderer
{
protected override void OnRenderButtonBackground(ToolStripItemRenderEventArgs e)
{
// check if the object being rendered is actually a ToolStripButton
if (e.Item is ToolStripButton)
{
ToolStripButton button = e.Item as ToolStripButton;
// only render checked items differently
if (button.Checked || button.Selected)
{
//do work here
}
else
base.OnRenderButtonBackground(e);
}
// if this object is not a ToolStripButton, use the normal render event
else
base.OnRenderButtonBackground(e);
}
protected override void OnRenderItemBackground(ToolStripItemRenderEventArgs e)
{
//do checking here like above
base.OnRenderItemBackground(e);
}
}
这对我有用