GetItemViewBounds Method (original) (raw)
Summary
Current physical (in control pixel coordinates) bounds of any part of an item.
Syntax
Parameters
item
The item. Must be a valid item inside this viewer.
part
The item part requested.
clipped
true to return the bounding rectangle intersected with the current viewer control area, otherwise; false.
Return Value
The bounding rectangle in pixels or LeadRectD.Empty if the item is not visible, does not have an image or outside the clipping area.
Example
This example will show how to use GetItemBounds to perform manual hit-testing on the item.
Start with the ImageViewer example, remove all the code inside the example function (search for the "// TODO: add example code here" comment) and insert the following code:
using Leadtools;
using Leadtools.Controls;
using Leadtools.Codecs;
using Leadtools.Drawing;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
public void GetItemViewBounds_Example()
{
// Clear all the images already the viewer
_imageViewer.Items.Clear();
// Use vertical view layout
_imageViewer.ViewLayout = new ImageViewerVerticalViewLayout();
// Make sure the item size is larger than the image size (thumbnails mode)
_imageViewer.ItemSize = LeadSize.Create(200, 200);
_imageViewer.ItemPadding = new Padding(8, 8, 8, 20);
_imageViewer.ImageBorderThickness = 1;
// Add 4 items to the viewer
using (var codecs = new RasterCodecs())
{
for (var page = 1; page <= 4; page++)
{
var item = new ImageViewerItem();
var fileName = Path.Combine(LEAD_VARS.ImagesDir, string.Format("ocr{0}.tif", page));
// Create a thumbnail from the image
using (var image = codecs.Load(fileName, page))
{
item.Image = image.CreateThumbnail(180, 180, 24, RasterViewPerspective.TopLeft, RasterSizeFlags.Resample);
}
item.Text = string.Format("Item {0}", page - 1);
_imageViewer.Items.Add(item);
}
}
// Hook to the viewer mouse click event
_imageViewer.MouseClick += (sender, e) =>
{
// Loop through each item, get the view bounds of the image (the physical location and size on the viewer surface of the item)
// and perform hit-testing
foreach (var item in _imageViewer.Items)
{
// Pass part as image and clipped as true, we are only interested on what we are seeing
var bounds = _imageViewer.GetItemViewBounds(item, ImageViewerItemPart.Image, true);
// Hit-test. GetItemViewBounds returns the value in the control coordinates, same as the mouse click
if (bounds.Contains(e.X, e.Y))
{
Debug.WriteLine("Clicked the image of item at index " + _imageViewer.Items.IndexOf(item));
return;
}
}
};
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}