DVX_GUI/dvx/widgets/widgetRadio.c

// widgetRadio.c — RadioGroup and Radio button widgets

#include "widgetInternal.h"


// ============================================================
// wgtRadio
// ============================================================

WidgetT *wgtRadio(WidgetT *parent, const char *text) {
    WidgetT *w = widgetAlloc(parent, WidgetRadioE);

    if (w) {
        w->as.radio.text = text;
        w->accelKey      = accelParse(text);

        // Auto-assign index based on position in parent
        int32_t idx = 0;

        for (WidgetT *c = parent->firstChild; c != w; c = c->nextSibling) {
            if (c->type == WidgetRadioE) {
                idx++;
            }
        }

        w->as.radio.index = idx;
    }

    return w;
}


// ============================================================
// wgtRadioGroup
// ============================================================

WidgetT *wgtRadioGroup(WidgetT *parent) {
    WidgetT *w = widgetAlloc(parent, WidgetRadioGroupE);

    if (w) {
        w->as.radioGroup.selectedIdx = 0;
    }

    return w;
}


// ============================================================
// widgetRadioGetText
// ============================================================

const char *widgetRadioGetText(const WidgetT *w) {
    return w->as.radio.text;
}


// ============================================================
// widgetRadioSetText
// ============================================================

void widgetRadioSetText(WidgetT *w, const char *text) {
    w->as.radio.text = text;
    w->accelKey = accelParse(text);
}


// ============================================================
// widgetRadioCalcMinSize
// ============================================================

void widgetRadioCalcMinSize(WidgetT *w, const BitmapFontT *font) {
    w->calcMinW = CHECKBOX_BOX_SIZE + CHECKBOX_GAP +
                   textWidthAccel(font, w->as.radio.text);
    w->calcMinH = DVX_MAX(CHECKBOX_BOX_SIZE, font->charHeight);
}


// ============================================================
// widgetRadioOnKey
// ============================================================

void widgetRadioOnKey(WidgetT *w, int32_t key) {
    if (key == ' ' || key == 0x0D) {
        // Select this radio
        if (w->parent && w->parent->type == WidgetRadioGroupE) {
            w->parent->as.radioGroup.selectedIdx = w->as.radio.index;

            if (w->parent->onChange) {
                w->parent->onChange(w->parent);
            }
        }

        wgtInvalidate(w);
    } else if (key == (0x50 | 0x100) || key == (0x4D | 0x100)) {
        // Down or Right — next radio in group
        if (w->parent && w->parent->type == WidgetRadioGroupE) {
            WidgetT *next = NULL;

            for (WidgetT *s = w->nextSibling; s; s = s->nextSibling) {
                if (s->type == WidgetRadioE && s->visible && s->enabled) {
                    next = s;
                    break;
                }
            }

            if (next) {
                w->focused = false;
                next->focused  = true;
                next->parent->as.radioGroup.selectedIdx = next->as.radio.index;

                if (next->parent->onChange) {
                    next->parent->onChange(next->parent);
                }

                wgtInvalidate(next);
            }
        }
    } else if (key == (0x48 | 0x100) || key == (0x4B | 0x100)) {
        // Up or Left — previous radio in group
        if (w->parent && w->parent->type == WidgetRadioGroupE) {
            WidgetT *prev = NULL;

            for (WidgetT *s = w->parent->firstChild; s && s != w; s = s->nextSibling) {
                if (s->type == WidgetRadioE && s->visible && s->enabled) {
                    prev = s;
                }
            }

            if (prev) {
                w->focused = false;
                prev->focused  = true;
                prev->parent->as.radioGroup.selectedIdx = prev->as.radio.index;

                if (prev->parent->onChange) {
                    prev->parent->onChange(prev->parent);
                }

                wgtInvalidate(prev);
            }
        }
    }
}


// ============================================================
// widgetRadioOnMouse
// ============================================================

void widgetRadioOnMouse(WidgetT *w, WidgetT *root, int32_t vx, int32_t vy) {
    (void)root;
    (void)vx;
    (void)vy;
    w->focused = true;

    if (w->parent && w->parent->type == WidgetRadioGroupE) {
        w->parent->as.radioGroup.selectedIdx = w->as.radio.index;

        if (w->parent->onChange) {
            w->parent->onChange(w->parent);
        }
    }
}


// ============================================================
// widgetRadioPaint
// ============================================================

void widgetRadioPaint(WidgetT *w, DisplayT *d, const BlitOpsT *ops, const BitmapFontT *font, const ColorSchemeT *colors) {
    uint32_t fg  = w->fgColor ? w->fgColor : colors->contentFg;
    uint32_t bg  = w->bgColor ? w->bgColor : colors->contentBg;
    int32_t boxY = w->y + (w->h - CHECKBOX_BOX_SIZE) / 2;

    // Draw radio box
    BevelStyleT bevel;
    bevel.highlight = colors->windowShadow;
    bevel.shadow    = colors->windowHighlight;
    bevel.face      = bg;
    bevel.width     = 1;
    drawBevel(d, ops, w->x, boxY, CHECKBOX_BOX_SIZE, CHECKBOX_BOX_SIZE, &bevel);

    // Draw filled dot if selected
    if (w->parent && w->parent->type == WidgetRadioGroupE &&
        w->parent->as.radioGroup.selectedIdx == w->as.radio.index) {
        rectFill(d, ops, w->x + 3, boxY + 3,
                 CHECKBOX_BOX_SIZE - 6, CHECKBOX_BOX_SIZE - 6, fg);
    }

    int32_t labelX = w->x + CHECKBOX_BOX_SIZE + CHECKBOX_GAP;
    int32_t labelY = w->y + (w->h - font->charHeight) / 2;
    drawTextAccel(d, ops, font, labelX, labelY, w->as.radio.text, fg, bg, false);

    if (w->focused) {
        int32_t labelW = textWidthAccel(font, w->as.radio.text);
        drawFocusRect(d, ops, labelX - 1, labelY - 1, labelW + 2, font->charHeight + 2, fg);
    }
}