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Programmatically Rearranging Images
Programmatically Rearranging Images
I've got an image viewer displaying a multipage PDF. I need to move the pages up or down in the document using a context menu. Moving them up in the image collection works fine, down not so much. I'm sure I have a simple mistake in my code here. Does anyone see the issue?
private void moveUpToolStripMenuItem_Click(object sender, EventArgs e)
{
int curIndex = pdfViewer.FocusedIndex;
int[] vwIndex = new int[1] {pdfViewer.FocusedIndex};
if (curIndex > 0)
{
pdfViewer.Images.MoveRange(curIndex - 1, vwIndex);
pdfViewer.FocusedIndex = curIndex - 1;
}
}
private void moveDownToolStripMenuItem_Click(object sender, EventArgs e)
{
int curIndex = pdfViewer.FocusedIndex;
int[] vwIndex = new int[1] {pdfViewer.FocusedIndex};
if (curIndex < pdfViewer.Images.Count - 1)
{
pdfViewer.Images.MoveRange(curIndex + 1, vwIndex);
pdfViewer.FocusedIndex = curIndex + 1;
}
}
Re: Programmatically Rearranging Images
Hello,
You have the problem with the moveDownToolStripMenuItem_Click method because your code has logical mistake. In your code you are trying to insert element with index "curIndex" into position "curIndex + 1" and this means that you are trying to insert element after itself - this action will not change order of images in image collection.
Here is correct code for moveDownToolStripMenuItem_Click method:
You have the problem with the moveDownToolStripMenuItem_Click method because your code has logical mistake. In your code you are trying to insert element with index "curIndex" into position "curIndex + 1" and this means that you are trying to insert element after itself - this action will not change order of images in image collection.
Here is correct code for moveDownToolStripMenuItem_Click method:
private void moveDownToolStripMenuItem_Click(object sender, EventArgs e)
{
int curIndex = thumbnailViewer1.FocusedIndex;
int[] vwIndex = new int[1] { thumbnailViewer1.FocusedIndex };
if (curIndex < thumbnailViewer1.Images.Count - 1)
{
thumbnailViewer1.Images.MoveRange(curIndex + 2, vwIndex);
thumbnailViewer1.FocusedIndex = curIndex + 1;
}
}
Best regards, Alexander
Re: Programmatically Rearranging Images
Thanks, Alex makes perfect sense now. Once again, great support!
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