Ticket #18319: clip.cpp

#include <Application.h>
#include <Window.h>
#include <View.h>
#include <Region.h>


enum OP {
    CONSTRAIN,
    CLIP,
    NONE
};

class App : public BApplication {
public:
    App();
};

class Window : public BWindow {
public:
    Window();
};

class View : public BView {
public:
    View(BRect frame, bool, OP);
    void Draw(BRect);
    void _DrawRect(BRect);

public:
    bool fSetScale;
    OP fOp;
};

int main()
{
    App app;
    app.Run();
    return 0;
}

App::App()
    :BApplication("application/x-vnd.some-test-app")
{
    Window *window = new Window();
    window->Show();
}

Window::Window()
    :BWindow(BRect(100,100,200,200), "clipping test", B_TITLED_WINDOW, B_QUIT_ON_WINDOW_CLOSE)
{
    BView* b = new BView(Bounds(), "background", B_FOLLOW_ALL, 0);
    b->SetViewColor(128,128,128);
    AddChild(b);
    AddChild(new View(BRect(0,0,20,20), false, NONE));
    AddChild(new View(BRect(25,0,45,20), false, CONSTRAIN));
    AddChild(new View(BRect(50,0,70,20), false, CLIP));
    AddChild(new View(BRect(0,25,20,45), true, NONE));
    AddChild(new View(BRect(25,25,45,45), true, CONSTRAIN));
    AddChild(new View(BRect(50,25,70,45), true, CLIP));
}

View::View(BRect frame, bool setScale, OP op)
    :BView(frame, "", B_FOLLOW_NONE, B_WILL_DRAW)
    ,fSetScale(setScale)
    ,fOp(op)
{
}


void
View::_DrawRect(BRect r) {
    PushState();
    SetHighColor(255,0,0);
    FillRect(r);
    if (fOp != NONE) {
        if (fOp == CONSTRAIN) {
            BRegion region(r);
            ConstrainClippingRegion(&region);
        } else {
            //RotateBy(0.1);
            ClipToRect(r);
        }
        SetHighColor(0,0,255);
        FillRect(Bounds());
    }
    PopState();
}


void
View::Draw(BRect update)
{
    if (fSetScale)
        SetScale(3);
    else
        ScaleBy(3,3);
    _DrawRect(BRect(3,3,5,5));
    _DrawRect(BRect(1,1,1,1));
}