Cdroid/apps/samples/viewpager1.cc

#include <windows.h>
#include <widget/simplemonthview.h>
#include <widget/pagetransformers.h>
static int mPageCount=5;
class MyPageAdapter:public PagerAdapter{
public:
    int getCount(){return 12;}
    bool isViewFromObject(View* view, void*object) { return view==object;}
    void* instantiateItem(ViewGroup* container, int position) {
        SimpleMonthView*sm=new  SimpleMonthView(100,100);
        sm->setMonthParams(23,Calendar::MAY+position,2021,-1,1,31);
        container->addView(sm);
        return sm;
    }
    void destroyItem(ViewGroup* container, int position,void* object){
        container->removeView((View*)object);
    }
    float getPageWidth(int position){return 1.f;}//if returned calue <1 OffscreenPageLimit must be larger to workfine 
};

int main(int argc,const char*argv[]){
    App app(argc,argv);
    Window*w=new Window(0,0,800,600);
    HorizontalScrollView* hs=new HorizontalScrollView(800,400);
    LinearLayout*layout=new LinearLayout(400,100);
    ColorStateList*cl=ColorStateList::inflate(nullptr,"/home/houzh/Miniwin/src/gui/res/color/textview.xml");
    layout->setId(10);
    hs->addView(layout);
    hs->setOverScrollMode(View::OVER_SCROLL_ALWAYS);
    w->addView(hs).setId(1);

    if(argc>1)mPageCount=std::max(5L,std::strtol(argv[1],nullptr,10));
    for(int i=0;i<16;i++){
        Button*btn=new Button("Hello Button"+std::to_string(i),150,30);
        btn->setPadding(5,5,5,5);
        btn->setTextColor(cl);
        btn->setTextSize(30);
        btn->setBackgroundColor(0xFF000000|i*20<<8|i*8);
        btn->setId(100+i);
        btn->setTextAlignment(View::TEXT_ALIGNMENT_CENTER);
        layout->addView(btn,new LinearLayout::LayoutParams(800,LayoutParams::WRAP_CONTENT));
    }
    ViewPager*pager=new ViewPager(800,560);
    MyPageAdapter*gpAdapter=new MyPageAdapter();
    pager->setOffscreenPageLimit(3);
    pager->setAdapter(gpAdapter);
    ViewPager::OnPageChangeListener listener;
    listener.onPageSelected=[&](int position){
        //hs->
    };
    listener.onPageScrolled=[&](int position, float positionOffset, int positionOffsetPixels){
        hs->scrollTo(position*pager->getWidth()+positionOffsetPixels,0);
    };
    pager->addOnPageChangeListener(listener);
    pager->setOverScrollMode(View::OVER_SCROLL_ALWAYS);
    w->addView(pager).setPos(0,40);
    gpAdapter->notifyDataSetChanged();
    pager->setCurrentItem(0);
    w->requestLayout();
    if(argc>1)
    pager->setPageTransformer(true,new RotateUpTransformer());

    app.exec();
}