text with color/background

[jordiperezartigues]

i am adding some text lines:
bbox->insert(new TStaticText(TRect(2,rTree,strwidth(treeName)+2,rTree+1), treeName));

how can i add some format to the text, color and background? perhaps is needed using drawText() instead atach an TStaticText?

[magiblot]

Hola, @jordiperezartigues!

TStaticText always draws text using the color specified by the parent window. Turbo Vision was originally designed so that colors could only be customized by modifying the application palette (the TPalette object returned by TProgram::getPalette()). Since that is cumbersome, in this port the mapColor() method has been made virtual so that colors can be customized at the view level.

For example, the following class draws text using a fixed color specified in the constructor:

class TColoredText : public TStaticText
{
public:
    TColoredText(const TRect &bounds, TStringView text, TColorAttr color) :
        TStaticText(bounds, text),
        color(color)
    {
    }

    virtual TColorAttr mapColor(uchar /*index*/) override
    {
        // Ignore palette index and always return the fixed attribute
        return color;
    }

private:
    TColorAttr color;
};

See the README for more information on how to define custom color attributes using TColorAttr.

[jordiperezartigues]

This works, i am doing:

 bbox->insert(new TColoredText(TRect(4,y,strwidth(treeName)+4,y+1), treeName,
                                      TColorAttr(TColorRGB(255,255,255),TColorRGB(13,115,204), slBold)));

Does exist some macro or define or static, to get the default white color and background window blue color?

[magiblot]

The default colors are not defined using RGB values but BIOS color attributes. So, to get the same colors as a default blue window you just need:

TColorBIOS blue = 0x1;
TColorBIOS white = 0x7;
TColorBIOS intenseWhite = 0xF;

TColorAttr whiteOnBlue = 0x17;
TColorAttr intenseWhiteOnBlue = 0x1F;

The conversion of BIOS colors into RGB is not done by Turbo Vision but it is instead handled by the terminal emulator. As the README says:

In terminal emulators, BIOS colors are mapped to the basic 16 ANSI colors.

There does exist a way to get those colors programatically, although it is rather hacky. TProgram's palettes are defined in the public headers...

tvision/include/tvision/app.h

Lines 142 to 151 in 85aaeca

	#define cpAppColor \
	"\x71\x70\x78\x74\x20\x28\x24\x17\x1F\x1A\x31\x31\x1E\x71\x1F" /* 1-15 */ \
	"\x37\x3F\x3A\x13\x13\x3E\x21\x3F\x70\x7F\x7A\x13\x13\x70\x7F\x7E" /* 16-31 */ \
	"\x70\x7F\x7A\x13\x13\x70\x70\x7F\x7E\x20\x2B\x2F\x78\x2E\x70\x30" /* 32-47 */ \
	"\x3F\x3E\x1F\x2F\x1A\x20\x72\x31\x31\x30\x2F\x3E\x31\x13\x38\x00" /* 48-63 */ \
	"\x17\x1F\x1A\x71\x71\x1E\x17\x1F\x1E\x20\x2B\x2F\x78\x2E\x10\x30" /* 64-79 */ \
	"\x3F\x3E\x70\x2F\x7A\x20\x12\x31\x31\x30\x2F\x3E\x31\x13\x38\x00" /* 80-95 */ \
	"\x37\x3F\x3A\x13\x13\x3E\x30\x3F\x3E\x20\x2B\x2F\x78\x2E\x30\x70" /* 96-111 */ \
	"\x7F\x7E\x1F\x2F\x1A\x20\x32\x31\x71\x70\x2F\x7E\x71\x13\x78\x00" /* 112-127 */ \
	"\x37\x3F\x3A\x13\x13\x30\x3E\x1E" /* 128-135 */

...therefore, you can inspect them manually:

const int appBlueWindowPaletteIndex = 8;
const int windowFramePassivePaletteIndex = 1;
const int windowFrameActivePaletteIndex = 2;

// White on blue
TColorAttr blueWindowFramePassive = cpAppColor[appBlueWindowPaletteIndex - 1 + windowFramePassivePaletteIndex - 1];
// Intense white on blue
TColorAttr blueWindowFrameActive  = cpAppColor[appBlueWindowPaletteIndex - 1 + windowFrameActivePaletteIndex - 1];

The palette indices can be found by looking at the comments in the header files:

tvision/include/tvision/app.h

Lines 231 to 237 in 85aaeca

	/* ---------------------------------------------------------------------- */
	/* class TProgram */
	/* */
	/* Palette layout */
	/* 1 = TBackground */
	/* 2-7 = TMenuView and TStatusLine */
	/* 8-15 = TWindow(Blue) */

tvision/include/tvision/views.h

Lines 979 to 984 in 85aaeca

	/* ---------------------------------------------------------------------- */
	/* class TWindow */
	/* */
	/* Palette layout */
	/* 1 = Frame passive */
	/* 2 = Frame active */

The palete indices in those comments are 1-based, so that's why I had to subtract 1 from each of them when accessing the cpAppColor array.