private void renderPanel_MouseDown(object sender, MouseEventArgs e)
{
_pickStart = _lastLocation = e.Location;
bool accumulate = ModifierKeys.HasFlag(Keys.Control);
// Switch to control dragging instead of selection if the mouse is pressed while above a control
if (DialogModel != null && DialogModel.EffectiveScale == 1)
{
// Loop through all controls from back to front
for (int i = DialogModel.Controls.Count - 1; i >= 0; i--)
{
if (DialogModel.Controls[i].DrawBox.Contains(_pickStart))
{
_dragControl = DialogModel.Controls[i];
// Remove all previous selections unless the user wants to accumulate selections
if (!accumulate)
{
listBox.ClearSelected();
}
// Toggle entries when accumulating
if (accumulate && listBox.SelectedItems.Contains(_dragControl))
{
listBox.SelectedItems.Remove(_dragControl);
}
else
{
listBox.SelectedItems.Add(_dragControl);
}
// Only select top-most control
return;
}
}
}
}
private void renderPanel_MouseUp(object sender, MouseEventArgs e)
{
if (renderPanel.Engine == null)
{
return;
}
if (_dragControl == null)
{
// Select all controls within the rectangle
var selectedControls = DialogModel.PickControls(Rectangle.FromLTRB(
_pickStart.X <e.X?_pickStart.X : e.X,
_pickStart.Y <e.Y?_pickStart.Y : e.Y,
_pickStart.X> e.X?_pickStart.X : e.X,
_pickStart.Y> e.Y ? _pickStart.Y : e.Y));
bool accumulate = ModifierKeys.HasFlag(Keys.Control);
// Remove all previous selections unless the user wants to accumulate selections
if (!accumulate)
{
listBox.ClearSelected();
}
// Transfer selection to the list box
if (selectedControls.Count == 0)
{
// Select dialog if no controls were selected
listBox.SelectedIndex = 0;
}
else
{
foreach (var control in selectedControls)
{
// Don't select GroupBoxes in multi-selections
if (!(selectedControls.Count > 1 && control is GroupBox))
{
// Toggle entries when accumulating
if (accumulate && listBox.SelectedItems.Contains(control))
{
listBox.SelectedItems.Remove(control);
}
else
{
listBox.SelectedItems.Add(control);
}
}
}
}
_pickRectangle = Rectangle.Empty;
}
else
{
// Check if the control was actually moved away from its initial position
if (_pickStart != e.Location)
{
OnChange();
}
_dragControl = null;
}
renderPanel.Engine.Render();
}
