Tag Archives: windows

Screen Shuffling with Delphi (first step to a Sliding Puzzle Game)

I’m sure you’ve seen it already. When the program starts it takes a picture of the current desktop, the picture is then cut into a number of rectangular pieces (all of the same size). A piece at some random position is “removed”. The main code randomly swaps that piece with the one next to it. Only pieces adjacent to the removed one can be moved into it.
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Generic Solution to Coloring the Focused Entry Control in Delphi Applications

Coloring Focused Entry Control
Looking for the best approach to change the background color (and other properties) of the focused data entry control in a Delphi (VCL) application?

By (Windows) design, the control on a data entry form which has the input focus is not drawn (/highlighted) differently from other controls (i.e. those without the input focus). In case of the TEdit (or TMemo and alike) control, only the blinking insertion point is displayed.

To provide visually more attractive user-friendly interfaces for your Delphi applications, you could decide to change the background color (and maybe some other properties) of the currently selected control – the one that has the input focus. Of course, this would include restoring to the original background color when the focus shifts to another control.
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Delphi High-DPI Road: Ensuring Your UI Looks Correctly for TImage, TColorBox, Owner Drawn TComboBox , TStatusBar and some more

So you want to go down the high-DPI road? Feeling alone? I did 🙂 The classical answer “it works on my machine” will not be sufficient here. Your non high-dpi aware Delphi application might look nice on your development machine, but it certainly looks super small or ugly stretched on your client’s shiny new 4K resolution laptop – and it really does not work – at least not how you and your client would expect!

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