How to Determine the Time Block Under the Mouse Pointer
- 2 minutes to read
The HitAtTime and Time properties of a time View’s HitTest object provide all the necessary functionality for the solution. HitAtTime determines whether the mouse pointer is currently located within a time block’s boundaries. Time returns the time corresponding to the tested time block.
A TcxHintStyleController component is used in the example to display real-time hit test results in the hint window at the mouse pointer location.
The scheduler’s hit testing logic calculates a coordinate point (see the hit test object’s HitPoint property) relative to the control’s top-left corner. To display a hint at the specified position, the TcxHintStyleController component requires screen coordinates (see the component’s ShowHint method). To supply this information, a GetMouseCursorPos routine from the cxControls unit is used in the example.
// ...
uses
cxControls, cxHint;
// ...
procedure TForm1.cxScheduler1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var
AHitTest: TcxSchedulerDayViewHitTest;
AHintPoint: TPoint;
begin
with TcxScheduler(Sender) do
begin
AHitTest := ViewDay.HitTest;
if AHitTest.HitAtTime then
begin
// obtain the mouse pointer position in screen coordinates
AHintPoint := GetMouseCursorPos;
cxHintStyleController1.ShowHint(AHintPoint.X, AHintPoint.Y + 25, 'Current time block:', DateTimeToStr(AHitTest.Time));
end
else
cxHintStyleController1.HideHint;
end;
end;
// hide the hint if the mouse pointer is out of the scheduler boundaries
procedure TForm1.cxScheduler1MouseLeave(Sender: TObject);
begin
cxHintStyleController1.HideHint;
end;
The following image shows the result:
