DVX_GUI/dvx/widgets/widgetDropdown.c

// widgetDropdown.c — Dropdown (select) widget

#include "widgetInternal.h"


// ============================================================
// wgtDropdown
// ============================================================

WidgetT *wgtDropdown(WidgetT *parent) {
    WidgetT *w = widgetAlloc(parent, WidgetDropdownE);

    if (w) {
        w->as.dropdown.selectedIdx = -1;
        w->as.dropdown.hoverIdx    = -1;
    }

    return w;
}


// ============================================================
// wgtDropdownGetSelected
// ============================================================

int32_t wgtDropdownGetSelected(const WidgetT *w) {
    if (!w || w->type != WidgetDropdownE) {
        return -1;
    }

    return w->as.dropdown.selectedIdx;
}


// ============================================================
// wgtDropdownSetItems
// ============================================================

void wgtDropdownSetItems(WidgetT *w, const char **items, int32_t count) {
    if (!w || w->type != WidgetDropdownE) {
        return;
    }

    w->as.dropdown.items     = items;
    w->as.dropdown.itemCount = count;

    if (w->as.dropdown.selectedIdx >= count) {
        w->as.dropdown.selectedIdx = -1;
    }
}


// ============================================================
// wgtDropdownSetSelected
// ============================================================

void wgtDropdownSetSelected(WidgetT *w, int32_t idx) {
    if (!w || w->type != WidgetDropdownE) {
        return;
    }

    w->as.dropdown.selectedIdx = idx;
}


// ============================================================
// widgetDropdownCalcMinSize
// ============================================================

void widgetDropdownCalcMinSize(WidgetT *w, const BitmapFontT *font) {
    // Width: widest item + button width + border
    int32_t maxItemW = font->charWidth * 8;

    for (int32_t i = 0; i < w->as.dropdown.itemCount; i++) {
        int32_t iw = (int32_t)strlen(w->as.dropdown.items[i]) * font->charWidth;

        if (iw > maxItemW) {
            maxItemW = iw;
        }
    }

    w->calcMinW = maxItemW + DROPDOWN_BTN_WIDTH + TEXT_INPUT_PAD * 2 + 4;
    w->calcMinH = font->charHeight + TEXT_INPUT_PAD * 2;
}


// ============================================================
// widgetDropdownOnMouse
// ============================================================

void widgetDropdownOnMouse(WidgetT *hit) {
    hit->as.dropdown.open     = !hit->as.dropdown.open;
    hit->as.dropdown.hoverIdx = hit->as.dropdown.selectedIdx;
    sOpenPopup = hit->as.dropdown.open ? hit : NULL;
}


// ============================================================
// widgetDropdownPaint
// ============================================================

void widgetDropdownPaint(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;

    // Sunken text area
    int32_t textAreaW = w->w - DROPDOWN_BTN_WIDTH;
    BevelStyleT bevel;
    bevel.highlight = colors->windowShadow;
    bevel.shadow    = colors->windowHighlight;
    bevel.face      = bg;
    bevel.width     = 2;
    drawBevel(d, ops, w->x, w->y, textAreaW, w->h, &bevel);

    // Draw selected item text
    if (w->as.dropdown.selectedIdx >= 0 && w->as.dropdown.selectedIdx < w->as.dropdown.itemCount) {
        drawText(d, ops, font, w->x + TEXT_INPUT_PAD,
                 w->y + (w->h - font->charHeight) / 2,
                 w->as.dropdown.items[w->as.dropdown.selectedIdx], fg, bg, true);
    }

    // Drop button
    BevelStyleT btnBevel;
    btnBevel.highlight = w->as.dropdown.open ? colors->windowShadow : colors->windowHighlight;
    btnBevel.shadow    = w->as.dropdown.open ? colors->windowHighlight : colors->windowShadow;
    btnBevel.face      = colors->buttonFace;
    btnBevel.width     = 2;
    drawBevel(d, ops, w->x + textAreaW, w->y, DROPDOWN_BTN_WIDTH, w->h, &btnBevel);

    // Down arrow in button
    int32_t arrowX = w->x + textAreaW + DROPDOWN_BTN_WIDTH / 2;
    int32_t arrowY = w->y + w->h / 2 - 1;

    for (int32_t i = 0; i < 4; i++) {
        drawHLine(d, ops, arrowX - 3 + i, arrowY + i, 7 - i * 2, colors->contentFg);
    }
}


// ============================================================
// widgetDropdownPaintPopup
// ============================================================

void widgetDropdownPaintPopup(WidgetT *w, DisplayT *d, const BlitOpsT *ops, const BitmapFontT *font, const ColorSchemeT *colors) {
    int32_t popX;
    int32_t popY;
    int32_t popW;
    int32_t popH;

    widgetDropdownPopupRect(w, font, d->clipH, &popX, &popY, &popW, &popH);

    // Draw popup border
    BevelStyleT bevel;
    bevel.highlight = colors->windowHighlight;
    bevel.shadow    = colors->windowShadow;
    bevel.face      = colors->contentBg;
    bevel.width     = 2;
    drawBevel(d, ops, popX, popY, popW, popH, &bevel);

    // Draw items
    int32_t      itemCount = w->as.dropdown.itemCount;
    const char **items     = w->as.dropdown.items;
    int32_t      selIdx    = w->as.dropdown.selectedIdx;
    int32_t      hoverIdx  = w->as.dropdown.hoverIdx;
    int32_t      scrollPos = w->as.dropdown.scrollPos;

    int32_t visibleItems = popH / font->charHeight;
    int32_t textX        = popX + TEXT_INPUT_PAD;
    int32_t textY        = popY + 2;
    int32_t textW        = popW - TEXT_INPUT_PAD * 2 - 4;

    for (int32_t i = 0; i < visibleItems && (scrollPos + i) < itemCount; i++) {
        int32_t  idx = scrollPos + i;
        int32_t  iy  = textY + i * font->charHeight;
        uint32_t ifg = colors->contentFg;
        uint32_t ibg = colors->contentBg;

        if (idx == hoverIdx || idx == selIdx) {
            ifg = colors->menuHighlightFg;
            ibg = colors->menuHighlightBg;
            rectFill(d, ops, popX + 2, iy, textW + TEXT_INPUT_PAD * 2, font->charHeight, ibg);
        }

        drawText(d, ops, font, textX, iy, items[idx], ifg, ibg, idx == hoverIdx || idx == selIdx);
    }
}