class MyForm3 : Form
{
RasterImageList imageList;
RasterCodecs codecs;
public MyForm3(string title)
{
Text = title;
// Set the size of the form
Size = new Size(400, 200);
// Create a new RasterImageList control
imageList = new RasterImageList();
imageList.Dock = DockStyle.Fill;
imageList.SelectionMode = RasterImageListSelectionMode.Single;
imageList.Size = Size;
Controls.Add(imageList);
imageList.BringToFront();
codecs = new RasterCodecs();
// Create three items
string imagesPath = LeadtoolsExamples.Common.ImagesPath.Path;
for(int i = 0; i < 3; i++)
{
// Load the image
int index = i + 1;
string imageFileName = imagesPath + "Image" + index.ToString() + ".cmp";
RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1);
RasterImageListItem item = new RasterImageListItem(image, 1, "Item" + index.ToString());
// Select the first item
if(i == 0)
item.Selected = true;
// Add the item to the image list
imageList.Items.Add(item);
}
// Change the item size
imageList.ItemSize = new Size(200, 200);
// Change the item image size
imageList.ItemImageSize = new Size(120, 120);
// We are going to draw the items ourselves
imageList.ViewStyle = RasterImageListViewStyle.OwnerDraw;
// Add a handler to the DrawItem event
imageList.DrawItem += new EventHandler<RasterImageListDrawItemEventArgs>(rasterImageList_DrawItem);
// Add the RasterImageList to the control collection.
Controls.Add(imageList);
}
private void rasterImageList_DrawItem(object sender, RasterImageListDrawItemEventArgs e)
{
RasterImageListItem item = e.Item;
RasterImageList imageList = item.ImageList;
Graphics g = e.Graphics;
// get the item rectangle
Rectangle rc = imageList.GetItemRectangle(item);
// sanity check
if(rc.IsEmpty)
return;
// we want to draw a 1 pixel black rectangle around the item
// then we fill the inside of the rectangle with white if the item
// is not selected or lightgray if it is
g.DrawRectangle(Pens.Black, rc.Left, rc.Top, rc.Width - 1, rc.Height - 1);
// we used up 1 pixel
rc.Inflate(-1, -1);
Brush b;
if(item.Selected)
b = Brushes.LightGray;
else
b = Brushes.White;
g.FillRectangle(b, rc);
// calculate the rectangles for image and text
if(imageList.ShowItemText)
{
// text is visible
// draw the text at the bottom of the item
int textHeight = (int)(g.MeasureString("WWW", imageList.Font).Height + 4);
Rectangle textRect = Rectangle.FromLTRB(
rc.Left,
rc.Bottom - textHeight,
rc.Right,
rc.Bottom);
if(!textRect.IsEmpty)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
sf.Trimming = StringTrimming.EllipsisPath;
sf.FormatFlags = StringFormatFlags.NoWrap;
g.DrawString(
item.Text,
imageList.Font,
Brushes.Black,
textRect,
sf);
sf.Dispose();
// we need to update the item rectangle for the space
// we used up to draw the text
rc.Height -= textRect.Height;
}
}
// rc is the image rectangle
if(!rc.IsEmpty)
{
// now rc holds the rectangle to draw the image into
// first, set the correct page
int savePage = -1;
if(item.Image.Page != item.Page)
{
// the page is different
// save current image page so we can set it back when we are done
savePage = item.Image.Page;
// disable the image events, we are going to set the page back,
// so we do not want anybody subscribing to this image Changed
// event to know we changed it.
item.Image.DisableEvents();
// set new page
item.Image.Page = item.Page;
}
try
{
// we want to center the image into whatever left of rc
Size itemImageSize = imageList.ItemImageSize;
Rectangle imageRect = new Rectangle(
rc.Left + (rc.Width - itemImageSize.Width) / 2,
rc.Top + (rc.Height - itemImageSize.Height) / 2,
itemImageSize.Width,
itemImageSize.Height);
// we want to keep the aspect ratio
imageRect = RasterImageList.GetFixedAspectRatioImageRectangle(
item.Image.ImageWidth,
item.Image.ImageHeight,
imageRect);
// draw the image
item.Image.Paint(g, imageRect, imageList.PaintProperties);
// finally, draw a black rectangle around the image
imageRect.Inflate(1, 1);
g.DrawRectangle(
Pens.Black,
imageRect.Left,
imageRect.Top,
imageRect.Width - 1,
imageRect.Height - 1);
}
finally
{
// reset the old page
if(savePage != -1)
{
item.Image.Page = savePage;
// re-enable the events
item.Image.EnableEvents();
}
}
}
}
}
public void RasterImageList_DrawItem(string title)
{
RasterCodecs.Startup();
MyForm3 form = new MyForm3(title);
form.ShowDialog();
RasterCodecs.Shutdown();
} |
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