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Add UI font scaling to UIUtil

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This commit is contained in:
Ryan Huffman 2015-02-18 13:33:19 -08:00
parent f44ec6da12
commit 0d60c09d03
2 changed files with 43 additions and 0 deletions
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40
interface/src/UIUtil.cpp
View file

@ -12,6 +12,9 @@
#include <QStyle>
#include <QStyleOptionTitleBar>
#include "DependencyManager.h"
#include "GLCanvas.h"
#include "UIUtil.h"
int UIUtil::getWindowTitleBarHeight(const QWidget* window) {
@ -27,3 +30,40 @@ int UIUtil::getWindowTitleBarHeight(const QWidget* window) {
return titleBarHeight;
}
// When setting the font size of a widget in points, the rendered text will be larger
// on Windows and Linux than on Mac OSX. This is because Windows and Linux use a DPI
// of 96, while OSX uses 72.
// In order to get consistent results across platforms, the font sizes need to be scaled
// based on the system DPI.
// This function will scale the font size of widget and all
// of its children recursively.
void UIUtil::scaleWidgetFontSizes(QWidget* widget) {
auto glCanvas = DependencyManager::get<GLCanvas>();
// This is the base dpi that we are targetting. This is based on Mac OSXs default DPI,
// and is the basis for all font sizes.
const float BASE_DPI = 72.0f;
#ifdef Q_OS_MAC
const float NATIVE_DPI = 72.0f;
#else
const float NATIVE_DPI = 96.0f;
#endif
float fontScale = (BASE_DPI / NATIVE_DPI) * (glCanvas->logicalDpiX() / NATIVE_DPI);
internalScaleWidgetFontSizes(widget, fontScale);
}
void UIUtil::internalScaleWidgetFontSizes(QWidget* widget, float scale) {
for (auto child : widget->findChildren<QWidget*>()) {
if (child->parent() == widget) {
internalScaleWidgetFontSizes(child, scale);
}
}
QFont font = widget->font();
font.setPointSizeF(font.pointSizeF() * scale);
widget->setFont(font);
}

3
interface/src/UIUtil.h
View file

@ -18,7 +18,10 @@
class UIUtil {
public:
static int getWindowTitleBarHeight(const QWidget* window);
static void scaleWidgetFontSizes(QWidget* widget);
private:
static void internalScaleWidgetFontSizes(QWidget* widget, float scale);
};
#endif // hifi_UIUtil_h