ScrollBar
Scrolling view using ScrollBar
main.cpp
#include <CtrlLib/CtrlLib.h>
using namespace Upp;
struct App : TopWindow {
ScrollBar sb;
int count;
int GetLineHeight() { return Arial(20).Info().GetHeight(); }
virtual void Paint(Draw& w)
{
Size sz = GetSize();
w.DrawRect(sz, SWhite);
int fcy = GetLineHeight();
int i = sb / fcy;
int y = i * fcy - sb;
while(i < count && y < sz.cy) {
w.DrawText(0, y, AsString(i++, true), Arial(20));
y += fcy;
}
}
virtual void Layout()
{
sb.SetPage(GetSize().cy);
}
virtual void MouseWheel(Point, int zdelta, dword)
{
sb.Wheel(zdelta);
}
bool Key(dword key, int)
{
return sb.VertKey(key);
}
void SetCount(int n)
{
count = n;
sb.SetTotal(n * GetLineHeight());
}
App() {
Sizeable().Zoomable().BackPaint();
AddFrame(sb);
sb.WhenScroll = [=] { Refresh(); };
sb.SetLine(GetLineHeight());
}
};
GUI_APP_MAIN
{
App app;
app.SetRect(0, 0, 100, 100);
app.SetCount(15);
app.Run();
}
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