forked from jackburton79/bescreencapture
/
PreviewView.cpp
150 lines (120 loc) · 2.83 KB
/
PreviewView.cpp
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#include "PreviewView.h"
#include <Bitmap.h>
#include <GroupLayout.h>
#include <LayoutBuilder.h>
#include <Screen.h>
#include <String.h>
class BitmapView : public BView {
public:
BitmapView();
virtual ~BitmapView();
virtual void Draw(BRect rect);
};
PreviewView::PreviewView()
:
BView("Rect View", B_WILL_DRAW),
fBitmapView(NULL),
fCoordRect(BScreen().Frame()),
fTimeStamp(0),
fChanged(true),
fLeftTop(NULL),
fRightBottom(NULL)
{
SetLayout(new BGroupLayout(B_VERTICAL));
BLayoutBuilder::Group<>(this)
.AddGroup(B_VERTICAL, 0)
.AddGroup(B_HORIZONTAL, 0)
.Add(fBitmapView = new BitmapView())
.End()
.End();
}
void
PreviewView::AttachedToWindow()
{
BView::AttachedToWindow();
SetViewColor(Parent()->ViewColor());
Update();
}
void
PreviewView::_SetRect(const BRect& rect)
{
fCoordRect = rect;
BString text;
text << "Capture area:\n";
text << "left: " << (int)rect.left << ", ";
text << "top: " << (int)rect.top << ", ";
text << "right: " << (int)rect.right << ", ";
text << "bottom: " << (int)rect.bottom;
SetToolTip(text.String());
}
static float
BRectRatio(const BRect& rect)
{
return rect.Width() / rect.Height();
}
static float
BRectHorizontalOverlap(const BRect& original, const BRect& resized)
{
return ((original.Height() / resized.Height() * resized.Width()) - original.Width()) / 2;
}
static float
BRectVerticalOverlap(const BRect& original, const BRect& resized)
{
return ((original.Width() / resized.Width() * resized.Height()) - original.Height()) / 2;
}
void
PreviewView::Update(const BRect* rect, BBitmap* bitmap)
{
if (Window() == NULL || Window()->IsHidden())
return;
if (rect != NULL)
_SetRect(*rect);
bigtime_t now = system_time();
if (bitmap == NULL) {
// Avoid updating preview too often
if (fTimeStamp + 50000 >= now)
return;
BScreen screen(Window());
screen.GetBitmap(&bitmap, false, &fCoordRect);
}
if (bitmap != NULL) {
BRect destRect;
BRect bitmapBounds = bitmap->Bounds();
BRect viewBounds = fBitmapView->Bounds();
if (BRectRatio(viewBounds) >= BRectRatio(bitmapBounds)) {
float overlap = BRectHorizontalOverlap(viewBounds, bitmapBounds);
destRect.Set(-overlap, 0, viewBounds.Width() + overlap,
viewBounds.Height());
} else {
float overlap = BRectVerticalOverlap(viewBounds, bitmapBounds);
destRect.Set(0, -overlap, viewBounds.Width(), viewBounds.Height() + overlap);
}
fTimeStamp = now;
fBitmapView->SetViewBitmap(bitmap,
bitmap->Bounds().OffsetToCopy(B_ORIGIN),
destRect,
B_FOLLOW_TOP|B_FOLLOW_LEFT, B_FILTER_BITMAP_BILINEAR);
Invalidate();
}
}
BRect
PreviewView::Rect() const
{
return fCoordRect;
}
// BitmapView
BitmapView::BitmapView()
:
BView("bitmap view", B_WILL_DRAW|B_FULL_UPDATE_ON_RESIZE)
{
}
BitmapView::~BitmapView()
{
}
void
BitmapView::Draw(BRect rect)
{
BView::Draw(rect);
SetHighColor(0, 0, 0);
StrokeRect(Bounds());
}