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