libui/test/page7c.c

// 13 october 2015
#include "test.h"

static uiArea *area;

struct handler {
	uiAreaHandler ah;
};

static struct handler handler;

#define areaSize 250
#define borderThickness 1
#define padding 30
#define circleRadius ((areaSize - padding) / 2)

static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *dp)
{
	uiDrawPath *path;
	uiDrawBrush brush;
	uiDrawStrokeParams sp;
	uiDrawBrushGradientStop stops[2];

	memset(&brush, 0, sizeof (uiDrawBrush));
	memset(&sp, 0, sizeof (uiDrawStrokeParams));

	// add some buffering to detect scrolls that aren't on the dot on Windows
	path = uiDrawNewPath(uiDrawFillModeWinding);
	uiDrawPathAddRectangle(path,
		-50, -50,
		areaSize + 50, areaSize + 50);
	uiDrawPathEnd(path);
	brush.Type = uiDrawBrushTypeSolid;
	brush.R = 0;
	brush.G = 1;
	brush.B = 0;
	brush.A = 1;
	uiDrawFill(dp->Context, path, &brush);
	uiDrawFreePath(path);

	path = uiDrawNewPath(uiDrawFillModeWinding);
	uiDrawPathAddRectangle(path,
		0, 0,
		areaSize, areaSize);
	uiDrawPathEnd(path);
	brush.Type = uiDrawBrushTypeSolid;
	brush.R = 1;
	brush.G = 1;
	brush.B = 1;
	brush.A = 1;
	uiDrawFill(dp->Context, path, &brush);
	brush.Type = uiDrawBrushTypeSolid;
	brush.R = 1;
	brush.G = 0;
	brush.B = 0;
	brush.A = 1;
	sp.Cap = uiDrawLineCapFlat;
	sp.Join = uiDrawLineJoinMiter;
	sp.Thickness = 1;
	sp.MiterLimit = uiDrawDefaultMiterLimit;
	uiDrawStroke(dp->Context, path, &brush, &sp);
	uiDrawFreePath(path);

	path = uiDrawNewPath(uiDrawFillModeWinding);
	uiDrawPathNewFigureWithArc(path,
		areaSize / 2, areaSize / 2,
		circleRadius,
		0, 2 * M_PI,
		0);
	uiDrawPathEnd(path);
	stops[0].Pos =0.0;
	stops[0].R = 0.0;
	stops[0].G = 1.0;
	stops[0].B = 1.0;
	stops[0].A = 1.0;
	stops[1].Pos = 1.0;
	stops[1].R = 0.0;
	stops[1].G = 0.0;
	stops[1].B = 1.0;
	stops[1].A = 1.0;
	brush.Type = uiDrawBrushTypeLinearGradient;
	brush.X0 = areaSize / 2;
	brush.Y0 = padding;
	brush.X1 = areaSize / 2;
	brush.Y1 = areaSize - padding;
	brush.Stops = stops;
	brush.NumStops = 2;
	uiDrawFill(dp->Context, path, &brush);
	uiDrawFreePath(path);
}

static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *e)
{
	// do nothing
}

static void handlerMouseCrossed(uiAreaHandler *ah, uiArea *a, int left)
{
	// do nothing
}

static void handlerDragBroken(uiAreaHandler *ah, uiArea *a)
{
	// do nothing
}

static int handlerKeyEvent(uiAreaHandler *ah, uiArea *a, uiAreaKeyEvent *e)
{
	if (e->Key == 'h' && !e->Up) {
		// TODO hide the widget momentarily on the h key
		return 1;
	}
	return 0;
}

uiGroup *makePage7c(void)
{
	uiGroup *group;

	handler.ah.Draw = handlerDraw;
	handler.ah.MouseEvent = handlerMouseEvent;
	handler.ah.MouseCrossed = handlerMouseCrossed;
	handler.ah.DragBroken = handlerDragBroken;
	handler.ah.KeyEvent = handlerKeyEvent;

	group = newGroup("Scrolling Drawing Test");

	area = uiNewScrollingArea((uiAreaHandler *) (&handler),
		areaSize, areaSize);
	uiGroupSetChild(group, uiControl(area));

	return group;
}