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Code Issues Releases Wiki Activity

Cache the playlist tree pixmap while the user is dragging stuff over it, making the repeated repaints less expensive.

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This commit is contained in:
David Sansome 2010-06-20 19:02:19 +00:00
parent c701c49004
commit dafedbf00c
2 changed files with 30 additions and 3 deletions
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31
src/playlist/playlistview.cpp
View File

@ -411,6 +411,7 @@ void PlaylistView::scrollContentsBy(int dx, int dy) {
if (dx) {
InvalidateCachedCurrentPixmap();
}
cached_tree_ = QPixmap();
QTreeView::scrollContentsBy(dx, dy);
@ -456,11 +457,28 @@ void PlaylistView::JumpToCurrentlyPlayingTrack() {
void PlaylistView::paintEvent(QPaintEvent* event) {
// Reimplemented to draw the drop indicator
QPainter p(viewport());
drawTree(&p, event->region());
// When the user is dragging some stuff over the playlist paintEvent gets
// called for the entire viewport every time the user moves the mouse.
// The drawTree is kinda expensive, so we cache the result and draw from the
// cache while the user is dragging. The cached pixmap gets invalidated in
// dragLeaveEvent, dropEvent and scrollContentsBy.
if (drop_indicator_row_ == -1)
QPainter p(viewport());
if (drop_indicator_row_ != -1) {
if (cached_tree_.isNull()) {
cached_tree_ = QPixmap(size());
cached_tree_.fill(Qt::transparent);
QPainter cache_painter(&cached_tree_);
drawTree(&cache_painter, event->region());
}
p.drawPixmap(0, 0, cached_tree_);
} else {
drawTree(&p, event->region());
return;
}
// Find the y position of the drop indicator
QModelIndex drop_index = model()->index(drop_indicator_row_, 0);
@ -516,12 +534,19 @@ void PlaylistView::dragMoveEvent(QDragMoveEvent *event) {
drop_indicator_row_ = index.isValid() ? index.row() : 0;
}
void PlaylistView::dragEnterEvent(QDragEnterEvent *event) {
QTreeView::dragEnterEvent(event);
cached_tree_ = QPixmap();
}
void PlaylistView::dragLeaveEvent(QDragLeaveEvent *event) {
QTreeView::dragLeaveEvent(event);
cached_tree_ = QPixmap();
drop_indicator_row_ = -1;
}
void PlaylistView::dropEvent(QDropEvent *event) {
QTreeView::dropEvent(event);
cached_tree_ = QPixmap();
drop_indicator_row_ = -1;
}

2
src/playlist/playlistview.h
View File

@ -61,6 +61,7 @@ class PlaylistView : public QTreeView {
void scrollContentsBy(int dx, int dy);
void paintEvent(QPaintEvent *event);
void dragMoveEvent(QDragMoveEvent *event);
void dragEnterEvent(QDragEnterEvent *event);
void dragLeaveEvent(QDragLeaveEvent *event);
void dropEvent(QDropEvent *event);
@ -112,6 +113,7 @@ class PlaylistView : public QTreeView {
QRect cached_current_row_rect_;
int cached_current_row_row_;
QPixmap cached_tree_;
int drop_indicator_row_;
};