TButton without shadow

[jordiperezartigues]

Is possible to have some TButton without the shadow?

[magiblot]

Hola, Jordi!

There is not a explicit way of doing this, but you can change the color palette so that the window's color is used both as the foreground and background color of shadow characters, so that they look the same as the window background. Otherwise, you would have to re-implement the draw method so that no shadow is drawn.

If you want all TButton in your application to have no shadow, you can simply change the application's global palette:

// Palette indexes as documented in the header files.
const int appGrayDialogPaletteIndex = 32;
const int appBlueDialogPaletteIndex = 64;
const int appCyanDialogPaletteIndex = 96;
const int dialogButtonShadowPaletteIndex = 15;

TPalette& TMyApp::getPalette() const
{
    static char cp[] = cpAppColor;
    // Make foreground and background colors the same in TButton shadows.
    cp[appGrayDialogPaletteIndex-1 + dialogButtonShadowPaletteIndex-1] = '\x77'; // Gray
    cp[appBlueDialogPaletteIndex-1 + dialogButtonShadowPaletteIndex-1] = '\x11'; // Blue
    cp[appCyanDialogPaletteIndex-1 + dialogButtonShadowPaletteIndex-1] = '\x33'; // Cyan

    static TPalette palette(cp, sizeof(cp));
    return palette;
}

Otherwise, you can create a custom TButton class and override the mapColor() method, but you could only use these custom buttons in window/dialog classes that you created yourself, since standard dialogs (e.g., TFileDialog) always use original TButtons.

class TButtonWithoutShadow : public TButton
{
public:

    using TButton::TButton;

    TColorAttr mapColor(uchar index) override;
};

const int buttonShadowPaletteIndex = 8;

TColorAttr TButtonWithoutShadow::mapColor(uchar index)
{
    TColorAttr original = TButton::mapColor(index);
    if (index == buttonShadowPaletteIndex)
        // Use the background color for both foreground and background, so that shadows are not visible.
        return (original >> 4) | (original & 0xF0);
    return original;
}