Move PlaylistProxyStyle to it's own file

src/playlist/playlistproxystyle.cpp

@@ -0,0 +1,71 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ * Copyright 2018-2023, Jonas Kvinge <jonas@jkvinge.net>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "config.h"
+
+#include <QProxyStyle>
+#include <QString>
+#include <QPainter>
+#include <QStyleOptionHeader>
+#include <QFontMetrics>
+
+#include "playlistproxystyle.h"
+#include "playlist.h"
+
+PlaylistProxyStyle::PlaylistProxyStyle(const QString &style) : QProxyStyle(style), common_style_(new QCommonStyle) {}
+
+void PlaylistProxyStyle::drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const {
+
+  if (element == CE_HeaderLabel) {
+    const QStyleOptionHeader *header_option = qstyleoption_cast<const QStyleOptionHeader*>(option);
+    const QRect &rect = header_option->rect;
+    const QString &text = header_option->text;
+    const QFontMetrics &font_metrics = header_option->fontMetrics;
+
+    // Spaces added to make transition less abrupt
+    if (rect.width() < font_metrics.horizontalAdvance(text + "  ")) {
+      const Playlist::Column column = static_cast<Playlist::Column>(header_option->section);
+      QStyleOptionHeader new_option(*header_option);
+      new_option.text = Playlist::abbreviated_column_name(column);
+      QProxyStyle::drawControl(element, &new_option, painter, widget);
+      return;
+    }
+  }
+
+  if (element == CE_ItemViewItem) {
+    common_style_->drawControl(element, option, painter, widget);
+  }
+  else {
+    QProxyStyle::drawControl(element, option, painter, widget);
+  }
+
+}
+
+void PlaylistProxyStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const {
+
+  if (element == QStyle::PE_PanelItemViewRow || element == QStyle::PE_PanelItemViewItem) {
+    common_style_->drawPrimitive(element, option, painter, widget);
+  }
+  else {
+    QProxyStyle::drawPrimitive(element, option, painter, widget);
+  }
+
+}