#include "image_view.h"


LImageView::LImageView(const char *name, BBitmap *bitmap, BAlignment align) : BView(name, B_SUPPORTS_LAYOUT|B_FRAME_EVENTS)
{
	SetBitmap(bitmap);
	SetAlignment(align);
}
void LImageView::SetBitmap(BBitmap *bitmap) {
	this->bitmap = bitmap;
	Invalidate();
}
void LImageView::SetAlignment(BAlignment align) {
	this->align = align;
	Invalidate();
}
BBitmap *LImageView::Bitmap() {
	return bitmap;
}
BAlignment LImageView::Alignment() {
	return align;
}
void LImageView::Draw(BRect updateRect) {
	if (bitmap == NULL) return; // Handle null image.
	int x = 0, y = 0;
	int mw, mh;
	int bw, bh;
	bw = bitmap->Bounds().Width();
	bh = bitmap->Bounds().Height();
	mw = Bounds().Width();
	mh = Bounds().Height();
	switch (align.Horizontal()) {
		case B_ALIGN_LEFT: {
			x = 0;
		} break;
		case B_ALIGN_HORIZONTAL_CENTER: {
		        x = (mw - bw) / 2;
		} break;
		case B_ALIGN_RIGHT: {
			x = mw - bw;
		} break;
	}
	switch (align.Vertical()) {
		case B_ALIGN_TOP: {
		        y = 0;
		} break;
		case B_ALIGN_VERTICAL_CENTER: {
			y = (mh - bh) / 2;
		} break;
		case B_ALIGN_BOTTOM: {
			y = mh - bh;
		} break;
	}
	BRect bitmap_rect(0, 0, bw, bh);
	BRect draw_rect(x, y, bw + x, bh + y);
	int left = updateRect.left;
	int right = updateRect.right;
	int top = updateRect.top;
	int bottom = updateRect.bottom;
	int x2 = x + bw;
	int y2 = y + bh;
	if (x > right || x2 < left || y > bottom || y2 < top) return;
	if (x < left) {
		bitmap_rect.left = left - x;
		draw_rect.left = left;
	}
	if (x2 > right) {
		bitmap_rect.right = right - x;
		draw_rect.right = right;
	}
	if (y < top) {
		bitmap_rect.top = top - y;
		draw_rect.top = top;
	}
	if (y2 > bottom) {
		bitmap_rect.bottom = bottom - y;
		draw_rect.bottom = bottom;
	}
	DrawBitmap(bitmap, bitmap_rect, draw_rect);
}