// Called after the tree view control has processed device input.
private void OnTreeViewInputProcessed(object sender, InputEventArgs eventArgs)
{
var treeView = (TreeView)sender;
var selectedItem = treeView.SelectedItem;
var inputService = treeView.InputService;
if (!inputService.IsMouseOrTouchHandled // Mouse was not handled before?
&& inputService.IsDoubleClick(MouseButtons.Left) // Double-click detected?
&& selectedItem == _lastSelectedItem // Both clicks were on the same item?
&& selectedItem != null // Any item is selected?
&& selectedItem.IsMouseOver) // The mouse is over the selected item?
{
// A tree view item was double-clicked. Show a message box with the data of the item.
// This is only for debugging, so we simply use the Windows Forms MessageBox.
#if WINDOWS
MessageBox.Show((string)selectedItem.UserData);
#endif
}
// Remember the selected item. This is necessary because we must be able to check if both
// clicks of the double-click were on the same item. When a tree view item is clicked,
// it is selected. Clicking two different items in rapid succession should not count as
// a double-click.
_lastSelectedItem = selectedItem;
}
//--------------------------------------------------------------
private void OnScreenInputProcessed(object sender, InputEventArgs eventArgs)
{
// Automatically hide the ToolTip if the Screen does not process input (because then
// we would not see mouse movement, so we close it immediately).
// Or close it if another UIControl was added on top that could hide the ToolTip.
if (IsToolTipOpen)
{
if (!Screen.InputEnabled // Screen does not handle input.
|| Screen.Children[Screen.Children.Count - 1] != ToolTipControl) // Another window was opened.
{
// ----- Screen was disabled, or another control was shown on top.
CloseToolTip();
return;
}
}
var context = eventArgs.Context;
if (context.MousePositionDelta == Vector2F.Zero)
{
// ----- No mouse movement --> Increase counter.
_noMouseMoveDuration += context.DeltaTime;
}
else
{
// ----- Mouse moved --> Close tool tip if mouse is no longer over control. Reset counter.
if (_control == null || !_control.IsMouseOver)
CloseToolTip();
_noMouseMoveDuration = TimeSpan.Zero;
return;
}
if (_noMouseMoveDuration >= ToolTipDelay)
{
// ----- Mouse was not moving for ToolTipDelay seconds --> Show tool tip.
// Get control under the mouse cursor. Search up the control hierarchy until we
// find a control with a tool tip string.
var control = Screen.ControlUnderMouse;
while (control != null && control.ToolTip == null)
control = control.VisualParent;
if (control != null)
{
// Show or update tool tip.
ShowToolTip(control.ToolTip, context.MousePosition);
_control = control;
}
// We do not want to check on the same position again in the next frame, so we set
// an extreme value that will be automatically reset when the mouse moves in the future.
_noMouseMoveDuration = TimeSpan.MinValue;
}
}
