private void InitializeToolStrip()
{
this.InitializeImageList(this.toolStrip1);
this.toolStrip1.Renderer = new RolloverItemRenderer();
RolloverItem item = this.CreateRolloverItem(
this.toolStrip1,
"RolloverItem on ToolStrip",
this.Font,
infoIconKey,
TextImageRelation.ImageBeforeText,
exclIconKey);
this.toolStrip1.Items.Add(item);
item = this.CreateRolloverItem(
this.toolStrip1,
"RolloverItem on ToolStrip",
this.Font,
infoIconKey,
TextImageRelation.ImageBeforeText,
exclIconKey);
this.toolStrip1.Items.Add(item);
}
// <snippet21>
protected override void OnRenderItemImage(
ToolStripItemImageRenderEventArgs e)
{
base.OnRenderItemImage(e);
RolloverItem item = e.Item as RolloverItem;
// If the ToolSTripItem is of type RolloverItem,
// perform custom rendering for the image.
if (item != null)
{
if (item.Clicked)
{
// The item is in the clicked state, so
// draw the image as usual.
e.Graphics.DrawImage(
e.Image,
e.ImageRectangle.X,
e.ImageRectangle.Y);
}
else
{
// In the unclicked state, gray out the image.
ControlPaint.DrawImageDisabled(
e.Graphics,
e.Image,
e.ImageRectangle.X,
e.ImageRectangle.Y,
item.BackColor);
}
}
}
// <snippet3>
// This method handles the Click event for the button.
// it selects the first item in the ToolStrip control
// by using the ToolStripITem.Select method.
private void button1_Click(object sender, EventArgs e)
{
RolloverItem item = this.toolStrip1.Items[0] as RolloverItem;
if (item != null)
{
item.Select();
this.Invalidate();
}
}
private void InitializeContextMenu()
{
Font f = new System.Drawing.Font(
"Arial",
18f,
FontStyle.Bold);
ContextMenuStrip cms = new ContextMenuStrip();
this.InitializeImageList(cms);
cms.Renderer = new RolloverItemRenderer();
cms.AutoSize = true;
cms.ShowCheckMargin = false;
cms.ShowImageMargin = false;
RolloverItem item = this.CreateRolloverItem(
cms,
"RolloverItem on ContextMenuStrip",
f,
handIconKey,
TextImageRelation.ImageBeforeText,
exclIconKey);
cms.Items.Add(item);
item = this.CreateRolloverItem(
cms,
"Another RolloverItem on ContextMenuStrip",
f,
questionIconKey,
TextImageRelation.ImageBeforeText,
exclIconKey);
cms.Items.Add(item);
item = this.CreateRolloverItem(
cms,
"And another RolloverItem on ContextMenuStrip",
f,
warningIconKey,
TextImageRelation.ImageBeforeText,
exclIconKey);
cms.Items.Add(item);
cms.Closing += new ToolStripDropDownClosingEventHandler(cms_Closing);
this.button1.ContextMenuStrip = cms;
}
// </snippet3>
// <snippet2>
// This utility method creates a RolloverItem
// and adds it to a ToolStrip control.
private RolloverItem CreateRolloverItem(
ToolStrip owningToolStrip,
string txt,
Font f,
string imgKey,
TextImageRelation tir,
string backImgKey)
{
RolloverItem item = new RolloverItem();
item.Alignment = ToolStripItemAlignment.Left;
item.AllowDrop = false;
item.AutoSize = true;
item.BackgroundImage = owningToolStrip.ImageList.Images[backImgKey];
item.BackgroundImageLayout = ImageLayout.Center;
item.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText;
item.DoubleClickEnabled = true;
item.Enabled = true;
item.Font = f;
// These assignments are equivalent. Each assigns an
// image from the owning toolstrip's image list.
item.ImageKey = imgKey;
//item.Image = owningToolStrip.ImageList.Images[infoIconKey];
//item.ImageIndex = owningToolStrip.ImageList.Images.IndexOfKey(infoIconKey);
item.ImageScaling = ToolStripItemImageScaling.None;
item.Owner = owningToolStrip;
item.Padding = new Padding(2);
item.Text = txt;
item.TextAlign = ContentAlignment.MiddleLeft;
item.TextDirection = ToolStripTextDirection.Horizontal;
item.TextImageRelation = tir;
return(item);
}
// </snippet21>
// <snippet22>
// This method defines the behavior for rendering the
// background of a ToolStripItem. If the item is a
// RolloverItem, it paints the item's BackgroundImage
// centered in the client area. If the mouse is in the
// item's client area, a border is drawn around it.
// If the item is on a drop-down or if it is on the
// overflow, a gradient is painted in the background.
protected override void OnRenderItemBackground(
ToolStripItemRenderEventArgs e)
{
base.OnRenderItemBackground(e);
RolloverItem item = e.Item as RolloverItem;
// If the ToolSTripItem is of type RolloverItem,
// perform custom rendering for the background.
if (item != null)
{
if (item.Placement == ToolStripItemPlacement.Overflow ||
item.IsOnDropDown)
{
using (LinearGradientBrush b = new LinearGradientBrush(
item.ContentRectangle,
Color.Salmon,
Color.DarkRed,
0f,
false))
{
e.Graphics.FillRectangle(b, item.ContentRectangle);
}
}
// The RolloverItem control only supports
// the ImageLayout.Center setting for the
// BackgroundImage property.
if (item.BackgroundImageLayout == ImageLayout.Center)
{
// Get references to the item's ContentRectangle
// and BackgroundImage, for convenience.
Rectangle cr = item.ContentRectangle;
Image bgi = item.BackgroundImage;
// Compute the center of the item's ContentRectangle.
int centerX = (cr.Width - bgi.Width) / 2;
int centerY = (cr.Height - bgi.Height) / 2;
// If the item is selected, draw the background
// image as usual. Otherwise, draw it as disabled.
if (item.Selected)
{
e.Graphics.DrawImage(bgi, centerX, centerY);
}
else
{
ControlPaint.DrawImageDisabled(
e.Graphics,
bgi,
centerX,
centerY,
item.BackColor);
}
}
// If the item is in the rollover state,
// draw a border around it.
if (item.Rollover)
{
ControlPaint.DrawFocusRectangle(
e.Graphics,
item.ContentRectangle);
}
}
}
