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When the form size changes, the distance of the button from the anchored sides is kept fixed. For example, to anchor a button to the bottom-right corner of the form, you place the button in the required position and set its Anchors property to. Aligning is good for some controls but not all of them, particularly buttons.īy using anchors, you can make the position of a control relative to any side of the form.
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Before this feature was introduced in Delphi 4, every control placed on a form had coordinates relative to the top and bottom, unless it was aligned to the bottom or right side. To let you create a nice, flexible user interface, with controls adapting themselves to the current size of the form, Delphi allows you to determine the relative position of a control with the Anchors property. The methods also look for a given input value, automatically filling the second edit box and moving the focus directly to the third one: If the control is left empty, it refuses to release the input focus and sets it back before showing a message to the user. The form's second event handler relates to the first edit box's OnExit event.
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(TLabel(Controls).FocusControl = Sender) then // copy the text, leaving off the initial & characterĬopy (TLabel(Controls).Caption, 2, 1000) Procedure TFocusForm.GlobalEnter(Sender: TObject) īegin for I := 0 to ControlCount - 1 do // if the control is a label if (Controls is TLabel) and // and the label is connected to the current edit box In the example, instead of storing extra information for each edit box, I've checked each control of the form to determine which label is connected to the current edit box (indicated by the Sender parameter): It does this by handling the controls' OnEnter event, using a single generic event handler to avoid repetitive code. The first is to identify, in the status bar, the edit control that has the focus. The program is simple and performs only two operations. Notice the & character in the labels, indicating a shortcut key, and the connection of these labels with corresponding edit boxes (using the FocusControl property):Ĭaption = 'InFocus' object Label1: TLabel Here is a summary of the properties for this example. Figure 5.7: The InFocus example at run timeįor the output of the status information, I've used the StatusBar component, with a single output area (obtained by setting its SimplePanel property to True).
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