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perf(ui): cache stylesheets to reduce memory usage

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Issue #5078
This commit is contained in:
Anthony Bilinski 2018-04-16 17:16:04 -07:00
parent 55d8922d69
commit 6d9d26db65
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GPG Key ID: 2AA8E0DA1B31FB3C
3 changed files with 28 additions and 14 deletions
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34
src/widget/style.cpp
View File

@ -92,15 +92,23 @@ QStringList Style::getThemeColorNames()
QList<QColor> Style::themeColorColors = {QColor(), QColor("#004aa4"), QColor("#97ba00"),
QColor("#c23716"), QColor("#4617b5")};
QString Style::getStylesheet(const QString& filename, const QFont& baseFont)
{
QFile file(filename);
if (!file.open(QFile::ReadOnly | QFile::Text)) {
qWarning() << "Stylesheet " << filename << " not found";
return QString();
}
// stylesheet filename, font -> stylesheet
// QString implicit sharing deduplicates stylesheets rather than constructing a new one each time
std::map<std::pair<const QString, const QFont>, const QString> Style::stylesheetsCache;
return resolve(file.readAll(), baseFont);
const QString Style::getStylesheet(const QString& filename, const QFont& baseFont)
{
const std::pair<const QString, const QFont> cacheKey(filename, baseFont);
auto it = stylesheetsCache.find(cacheKey);
if (it != stylesheetsCache.end())
{
// cache hit
return it->second;
}
// cache miss, new styleSheet, read it from file and add to cache
const QString newStylesheet = resolve(filename, baseFont);
stylesheetsCache.insert(std::make_pair(cacheKey, newStylesheet));
return newStylesheet;
}
QColor Style::getColor(Style::ColorPalette entry)
@ -128,8 +136,15 @@ QFont Style::getFont(Style::Font font)
return fonts[font];
}
QString Style::resolve(QString qss, const QFont& baseFont)
const QString Style::resolve(const QString& filename, const QFont& baseFont)
{
QFile file{filename};
if (!file.open(QFile::ReadOnly | QFile::Text)) {
qWarning() << "Stylesheet " << filename << " not found";
return QString("");
}
QString qss = file.readAll();
if (dict.isEmpty()) {
dict = {// colors
{"@green", Style::getColor(Style::Green).name()},
@ -162,7 +177,6 @@ QString Style::resolve(QString qss, const QFont& baseFont)
for (const QString& key : dict.keys()) {
qss.replace(QRegularExpression(QString("%1\\b").arg(key)), dict[key]);
}
return qss;
}

5
src/widget/style.h
View File

@ -59,10 +59,10 @@ public:
};
static QStringList getThemeColorNames();
static QString getStylesheet(const QString& filename, const QFont& baseFont = QFont());
static const QString getStylesheet(const QString& filename, const QFont& baseFont = QFont());
static QColor getColor(ColorPalette entry);
static QFont getFont(Font font);
static QString resolve(QString qss, const QFont& baseFont = QFont());
static const QString resolve(const QString& filename, const QFont& baseFont = QFont());
static void repolish(QWidget* w);
static void setThemeColor(int color);
static void setThemeColor(const QColor& color);
@ -70,6 +70,7 @@ public:
static QPixmap scaleSvgImage(const QString& path, uint32_t width, uint32_t height);
static QList<QColor> themeColorColors;
static std::map<std::pair<const QString, const QFont>, const QString> stylesheetsCache;
signals:
void themeChanged();

3
src/widget/widget.cpp
View File

@ -143,8 +143,7 @@ void Widget::init()
connect(actionQuit, &QAction::triggered, qApp, &QApplication::quit);
layout()->setContentsMargins(0, 0, 0, 0);
ui->friendList->setStyleSheet(
Style::resolve(Style::getStylesheet(":/ui/friendList/friendList.css")));
ui->friendList->setStyleSheet(Style::getStylesheet(":/ui/friendList/friendList.css"));
profilePicture = new MaskablePixmapWidget(this, QSize(40, 40), ":/img/avatar_mask.svg");
profilePicture->setPixmap(QPixmap(":/img/contact_dark.svg"));