DolphinQt2: add QtUtils/ElidedButton

Source/Core/DolphinQt2/QtUtils/ElidedButton.cpp

@@ -0,0 +1,40 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt2/QtUtils/ElidedButton.h"
+
+#include <QFontMetrics>
+#include <QStyleOptionButton>
+#include <QStylePainter>
+
+ElidedButton::ElidedButton(const QString& text, Qt::TextElideMode elide_mode)
+    : QPushButton(text, nullptr), m_elide_mode{elide_mode}
+{
+}
+
+Qt::TextElideMode ElidedButton::elideMode() const
+{
+  return m_elide_mode;
+}
+
+void ElidedButton::setElideMode(Qt::TextElideMode elide_mode)
+{
+  if (elide_mode == m_elide_mode)
+    return;
+
+  m_elide_mode = elide_mode;
+  repaint();
+}
+
+void ElidedButton::paintEvent(QPaintEvent* event)
+{
+  QStyleOptionButton option;
+  initStyleOption(&option);
+
+  option.text = fontMetrics().elidedText(
+      text(), m_elide_mode,
+      style()->subElementRect(QStyle::SE_PushButtonContents, &option, this).width());
+
+  QStylePainter{this}.drawControl(QStyle::CE_PushButton, option);
+}

Source/Core/DolphinQt2/QtUtils/ElidedButton.h

@@ -0,0 +1,20 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QPushButton>
+
+class ElidedButton : public QPushButton
+{
+public:
+  ElidedButton(const QString& text = QStringLiteral(""),
+               Qt::TextElideMode elide_mode = Qt::ElideRight);
+  Qt::TextElideMode elideMode() const;
+  void setElideMode(Qt::TextElideMode elide_mode);
+
+private:
+  void paintEvent(QPaintEvent* event);
+  Qt::TextElideMode m_elide_mode;
+};