mirror of
https://github.com/AyuGram/AyuGramDesktop.git
synced 2026-08-06 20:03:12 +00:00
23rd
52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
/*
|
|
This file is part of Telegram Desktop,
|
|
the official desktop application for the Telegram messaging service.
|
|
|
|
For license and copyright information please follow this link:
|
|
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
|
|
*/
|
|
#pragma once
|
|
|
|
#include "base/timer.h"
|
|
#include "base/flat_map.h"
|
|
|
|
class PeerListRowsScrollCache final {
|
|
public:
|
|
explicit PeerListRowsScrollCache(Fn<void()> stopped);
|
|
|
|
void markScrolling();
|
|
[[nodiscard]] bool scrolling() const {
|
|
return _scrolling;
|
|
}
|
|
|
|
template <typename PaintToImage>
|
|
void paintRow(
|
|
QPainter &p,
|
|
uint64 rowId,
|
|
QSize physicalSize,
|
|
int ratio,
|
|
PaintToImage &&paintToImage) {
|
|
auto &image = _images[rowId];
|
|
if (image.size() != physicalSize) {
|
|
if (_images.size() > kLimit) {
|
|
_images.clear();
|
|
image = _images[rowId];
|
|
}
|
|
image = QImage(physicalSize, QImage::Format_RGB32);
|
|
image.setDevicePixelRatio(ratio);
|
|
paintToImage(image);
|
|
}
|
|
p.drawImage(0, 0, image);
|
|
}
|
|
|
|
void invalidate(uint64 rowId);
|
|
|
|
private:
|
|
static constexpr auto kLimit = 256;
|
|
|
|
base::flat_map<uint64, QImage> _images;
|
|
base::Timer _stopTimer;
|
|
bool _scrolling = false;
|
|
|
|
};
|