message preview refactor, several bugs about label size, animations are now playing in previews

ui/widgets/messageline/preview.h

@@ -0,0 +1,79 @@
+/*
+ * Squawk messenger. 
+ * Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+ * 
+ * This program 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.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PREVIEW_H
+#define PREVIEW_H
+
+#include <QWidget>
+#include <QString>
+#include <QPoint>
+#include <QSize>
+#include <QLabel>
+#include <QIcon>
+#include <QPixmap>
+#include <QMovie>
+#include <QFont>
+#include <QFontMetrics>
+
+#include <shared/global.h>
+
+/**
+ * @todo write docs
+ */
+class Preview {
+public:
+    Preview(const QString& pPath, const QSize& pMaxSize, const QPoint& pos, bool pRight, QWidget* parent);
+    ~Preview();
+    
+    void actualize(const QString& newPath, const QSize& newSize, const QPoint& newPoint);
+    void setPosition(const QPoint& newPoint);
+    void setSize(const QSize& newSize);
+    bool setPath(const QString& newPath);
+    bool isFileReachable() const;
+    QSize size() const;
+    
+    static QSize constrainAttachSize(QSize src, QSize bounds);
+    static QSize calculateAttachSize(const QString& path, const QRect& bounds);
+    static bool fontInitialized;
+    static QFont font;
+    static QFontMetrics metrics;
+    
+private:
+    void initializeElements();
+    void positionElements();
+    void clean();
+    void applyNewSize();
+    void applyNewMaxSize();
+    
+private:
+    Shared::Global::FileInfo info;
+    QString path;
+    QSize maxSize;
+    QSize actualSize;
+    QSize cachedLabelSize;
+    QPoint position;
+    QLabel* widget;
+    QLabel* label;
+    QWidget* parent;
+    QMovie* movie;
+    bool fileReachable;
+    bool actualPreview;
+    bool right;
+};
+
+#endif // PREVIEW_H