TdxCustomRangeControl.BeginUpdate Method

Disables repainting of the range control.

Declaration

procedure BeginUpdate;

Remarks

Each time the range control’s content is changed (such as the data range selection, scale zooming and scrolling, data range selection and visualization model and its settings, etc.), the control initiates repainting to reflect these changes.

To improve the performance of a range control-based application, enclose the code that performs multiple modifications to the range control’s content within the BeginUpdate/EndUpdate procedure blocks.

The BeginUpdate procedure postpones updates. To apply the changes made, invoke the EndUpdate procedure. Ensure that every call to BeginUpdate is followed by a call to the EndUpdate procedure, even if an exception occurs.