OnSelectCell event occurs before a cell in the grid is selected.
Write an OnSelectCell event handler to specify whether any particular cell in the grid can be selected. The Col and Row parameters indicate the column and row indexes of the cell that is about to be selected. Set the CanSelect parameter to False to prevent the cell being selected.
Here is the working example of the…
OnDrawCell event Occurs when a cell in the grid needs to be drawn.
We write an OnDrawCell event handler to draw the contents of all the cells in the grid. Draw on the cell using the methods of the Canvas property. The Rect parameter indicates the location of the cell…
OnChange event occurs when the user changes the text displayed in the edit region.
We write an OnChange event handler to take specific action immediately after the user edits the text in the edit region or selects an item from the list. The Text property gives the new…
OnClick event occurs when the user clicks the control.
We use the OnClick event handler to respond when the user clicks the control. If the control has an associated action, and that action has an OnExecute method, the action’s OnExecute method responds to click events unless it is superseded by an OnClick event handler.
Usually, OnClick occurs when the user presses and…
BiDiMode property or DelphiVCL.Application.BiDiMode is used to indicate the layout of the application when running under Middle Eastern versions of Windows.
Use BiDiMode to specify the bi-directional mode for the application. The bi-directional mode controls the…
BiDiKeyboard property or DelphiVCL.Application.BiDiKeyboard is used to specify the name of the keyboard map that should be used in middle-east locales when text reads from right to left.
This name is a string composed of the hexadecimal value of the language…
BeginInvoke method or DelphiVCL.Application.BeginInvoke is used to perform an asynchronous call to the method specified by either AProc or AFunc.
The AContext parameter specifies the context where the method executes in. This context corresponds to the main thread. In case of a Tcontrol descendant, it executes in the context of the thread on which the closest window handle was…
BeforeDestruction method or DelphiVCL.Application.BeforeDestruction is used to respond before the first destructor executes.
BeforeDestruction is called automatically before the object’s first destructor executes. Do not call it explicitly in your…
AutoDragDocking property or DelphiVCL.Application.AutoDragDocking is used to indicate whether dragged windows are automatically docked.
Set AutoDragDocking to enable drag-and-dock behavior when windows are dragged. When AutoDragDocking is true, dragged windows are…
TColorBoxStyle specifies how a color box control displays its selections.
The following table lists the possible values of TColorBoxStyle:
Style
Meaning when included
cbStandardColors
The color box lists the first 16 color constants from the Graphics unit. These are the constants such as clRed or clBlack, that represent fixed RGB values.
cbExtendedColors
The…
