87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
#define DVX_WIDGET_IMPL
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// widgetSpacer.c -- Spacer widget (invisible stretching element)
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//
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// A zero-sized invisible widget with weight=100, used purely for
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// layout control. It absorbs leftover space in box layouts, pushing
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// sibling widgets apart. Common use: place a spacer between buttons
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// in a toolbar to right-align some buttons, or between a label and
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// a control to create elastic spacing.
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//
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// Because calcMinSize returns 0x0, the spacer takes no space when
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// there is none to spare, but greedily absorbs extra space via its
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// weight. This is the simplest possible layout primitive -- no paint,
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// no mouse, no keyboard, no state. The entire widget is effectively
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// just a weight value attached to a position in the sibling list.
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#include "dvxWidgetPlugin.h"
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static int32_t sTypeId = -1;
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// ============================================================
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// widgetSpacerCalcMinSize
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// ============================================================
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void widgetSpacerCalcMinSize(WidgetT *w, const BitmapFontT *font) {
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(void)font;
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w->calcMinW = 0;
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w->calcMinH = 0;
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}
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// ============================================================
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// DXE registration
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// ============================================================
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static const WidgetClassT sClassSpacer = {
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.version = WGT_CLASS_VERSION,
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.flags = 0,
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.handlers = {
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[WGT_METHOD_CALC_MIN_SIZE] = (void *)widgetSpacerCalcMinSize,
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}
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};
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// ============================================================
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// Widget creation functions
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// ============================================================
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WidgetT *wgtSpacer(WidgetT *parent) {
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WidgetT *w = widgetAlloc(parent, sTypeId);
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if (w) {
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w->weight = 100;
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}
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return w;
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}
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// ============================================================
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// DXE registration
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// ============================================================
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static const struct {
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WidgetT *(*create)(WidgetT *parent);
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} sApi = {
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.create = wgtSpacer
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};
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static const WgtIfaceT sIface = {
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.basName = "Spacer",
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.props = NULL,
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.propCount = 0,
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.methods = NULL,
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.methodCount = 0,
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.events = NULL,
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.eventCount = 0,
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.createSig = WGT_CREATE_PARENT
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};
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void wgtRegister(void) {
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sTypeId = wgtRegisterClass(&sClassSpacer);
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wgtRegisterApi("spacer", &sApi);
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wgtRegisterIface("spacer", &sIface);
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}
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