![]() ![]() If not (ThemeServices. Procedure TMyRadioButton.CnCtlColorStatic(var Msg: TWMCtlColorStatic) In TCustomRadioGroup descendants, where this property is published. R := Rect(Left, Top, Left + Width, Height + Top) Items holds a TStrings object that lists the captions of the radio buttons in the group. If not (ThemeServices.ThemesEnabled or DoubleBuffered) Procedure TMyRadioButton.WmEraseBkgnd(var Msg: TWMEraseBkgnd) If not (ThemeServices.ThemesEnabled or DoubleBuffered) then Also, the TTreeView DragMode property set to dmAutomatic, and the TTreeView OnDragOver event handler must be implemented to accept the drop. This example requires a populated TreeView. Procedure TMyRadioButton.WmPaint(var Msg: TWMNCPaint) / The following code uses GetNodeAt to add a dragged node as a child of the node under the mouse when it is dropped. Params.ExStyle := Params.ExStyle or WS_EX_TRANSPARENT Procedure TMyRadioButton.CreateParams(var Params: TCreateParams) You can create individual radio buttons using TRadioButton or use a group to automatically arrange radio buttons into groups. Procedure CreateParams(var Params: TCreateParams) override TRadioButton, also called option button, presents a set of mutually exclusive choices. Procedure WmPaint(var Msg: TWMNCPaint) message WM_PAINT Calling the Hide method sets it to false. ![]() Calling the Show method sets the control's Visible property to true. If Visible is false, the control is not visible. Procedure WmEraseBkgnd(var Msg: TWMEraseBkgnd) message WM_ERASEBKGND Use the Visible property to control the visibility of the control at runtime. Procedure CnCtlColorStatic(var Msg: TWMCtlColorStatic) message CN_CTLCOLORSTATIC A problem not easily noticable can (sometimes) be duplicated by bringing a different window in front of the form containing the controls, and then slowly moving it aside, sometimes this leaves some artifacts. Problems easily noticable are, as you would guess from the code, it's a bit flickery and it is not transparent when DoubleBuffered. The below is the same code applied to the RadioButton. I, once, had tried to make the CheckBox transparent for when runtime themes are not enabled in project options, or a classic theme is selected with the OS the result was not perfect. To add radio buttons to a radio group, edit the Items property in the Object Inspector each string in Items makes a radio button appear in the group box. Let’s browse all the properties, methods, and built-in properties of the DelphiVCL.RadioButton using dir () command: 1 2 3 import DelphiVCL dir(DelphiVCL.RadioButton) See the responses in our Windows command prompt: You can also read short informations about the DelphiVCL. If no Values strings are set, each button's caption serves as its value.I agree with Andreas and Serg in that the control is transparent when themes are enabled. Specify values for the buttons by editing the Values property in the Object Inspector the first string in Values corresponds to the first string in Items, and so forth. When the user selects a radio button, the "value" of the selected button becomes the contents of the linked field for the current record in the dataset. Each string in Items makes a radio button appear in the group box with the string as its caption. To add radio buttons to a TDBRadioGroup, edit the Items property in the Object Inspector. They are also useful for displaying data from fields that have only a few possible values. Let’s browse all the properties, methods, and built-in properties of the DelphiVCL.RadioButton using dir () command: 1 2 3 import DelphiVCL dir(DelphiVCL.RadioButton) See the responses in our Windows command prompt: You can also read short informations about the DelphiVCL.RadioButton using the print () command: 1 2 print(DelphiVCL. Click on a RadioButton on the Controlling form to activate the. Database radio groups provide an easy way to ensure that the user enters one (or at most one) of the options presented for a field. This Delphi Outlook example demonstrates how to add a property page to the Tools. Radio buttons that are contained directly in the same control component are said to be "grouped" when a radio button is checked, all other radio buttons in its group become unchecked. Specify values for the buttons by editing the Values property in the Object Inspector the first string in Values corresponds to the first string in Items, and. Use TDBRadioGroup to group a set of data-aware radio buttons. TDBRadioGroup represents a group of radio buttons connected to a database. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |