////  UIUtil.cpp//  interface/src////  Created by Ryan Huffman on 09/02/2014.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "UIUtil.h" #include <QStyle>#include <QStyleOptionTitleBar> int UIUtil::getWindowTitleBarHeight(const QWidget* window) {    QStyleOptionTitleBar options;    options.titleBarState = 1;    options.titleBarFlags = Qt::Window;    int titleBarHeight = window->style()->pixelMetric(QStyle::PM_TitleBarHeight, &options, window); #if defined(Q_OS_MAC)    // The height on OSX is 4 pixels too tall    titleBarHeight -= 4;#endif     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.//// When creating widgets, if a font size isn't explicitly set Qt will choose a// reasonable, but often different font size across platforms.  This means// YOU SHOUD EXPLICITLY SET ALL FONT SIZES and call this function OR not use// this function at all.  If you mix both you will end up with inconsistent results// across platforms.void UIUtil::scaleWidgetFontSizes(QWidget* widget) {    // 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     // Scale fonts based on the native dpi.  On Windows, where the native DPI is 96,    // the scale will be: 72.0 / 96.0 = 0.75    float fontScale = BASE_DPI / NATIVE_DPI;     internalScaleWidgetFontSizes(widget, fontScale);} // Depth-first traversal through widget hierarchy.  It is important to do a depth-first// traversal because modifying the font size of a parent node can affect children.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() * (double)scale);    widget->setFont(font);}