[freetype2-demos] gsoc-2022-chariri-2 afdd953 16/30: [ftinspect] Support drag & drop to open font files.

[Werner Lemberg]

branch: gsoc-2022-chariri-2
commit afdd95346e45b334778a6de97b59181e812ee4b1
Author: Charlie Jiang <w@chariri.moe>
Commit: Charlie Jiang <w@chariri.moe>

    [ftinspect] Support drag & drop to open font files.
    
    A possible issue is that no checking is performed to ensure the dropped 
files
    are real font files.
    
    * src/ftinspect/maingui.cpp, src/ftinspect/maingui.hpp: Use custom
    `dragEnterEvent` and `dropEvent` to accept drop operations. Dropping was set
    to unaccepted for `glyphView_` to let the event pass down to `MainGUI`.
---
 src/ftinspect/maingui.cpp | 52 ++++++++++++++++++++++++++++++++++++++++++++---
 src/ftinspect/maingui.hpp |  5 +++++
 2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/src/ftinspect/maingui.cpp b/src/ftinspect/maingui.cpp
index 32e6a01..fadc782 100644
--- a/src/ftinspect/maingui.cpp
+++ b/src/ftinspect/maingui.cpp
@@ -11,6 +11,7 @@
 #include <QMessageBox>
 #include <QSettings>
 #include <QScrollBar>
+#include <QMimeData>
 
 #include <freetype/ftdriver.h>
 
@@ -24,6 +25,7 @@ MainGUI::MainGUI(Engine* engine)
   createActions();
   createMenus();
   createStatusBar();
+  setupDragDrop();
 
   readSettings();
 
@@ -48,6 +50,37 @@ MainGUI::closeEvent(QCloseEvent* event)
 }
 
 
+void
+MainGUI::dragEnterEvent(QDragEnterEvent* event)
+{
+  if (event->mimeData()->hasUrls())
+    event->acceptProposedAction();
+}
+
+
+void
+MainGUI::dropEvent(QDropEvent* event)
+{
+  auto mime = event->mimeData();
+  if (!mime->hasUrls())
+    return;
+
+  QStringList fileNames;
+  for (auto& url : mime->urls())
+  {
+    if (!url.isLocalFile())
+      continue;
+    fileNames.append(url.toLocalFile());
+  }
+
+  if (fileNames.empty())
+    return;
+
+  event->acceptProposedAction();
+  openFonts(fileNames);
+}
+
+
 void
 MainGUI::about()
 {
@@ -82,8 +115,6 @@ MainGUI::aboutQt()
 void
 MainGUI::loadFonts()
 {
-  int oldSize = engine_->numberOfOpenedFonts();
-
   QStringList files = QFileDialog::getOpenFileNames(
                         this,
                         tr("Load one or more fonts"),
@@ -91,8 +122,15 @@ MainGUI::loadFonts()
                         "",
                         NULL,
                         QFileDialog::ReadOnly);
+  openFonts(files);
+}
+
 
-  engine_->openFonts(files);
+void
+MainGUI::openFonts(QStringList const& fileNames)
+{
+  int oldSize = engine_->numberOfOpenedFonts();
+  engine_->openFonts(fileNames);
 
   // if we have new fonts, set the current index to the first new one
   if (oldSize < engine_->numberOfOpenedFonts())
@@ -903,6 +941,14 @@ MainGUI::createStatusBar()
 }
 
 
+void
+MainGUI::setupDragDrop()
+{
+  setAcceptDrops(true);
+  glyphView_->setAcceptDrops(false);
+}
+
+
 void
 MainGUI::setDefaults()
 {
diff --git a/src/ftinspect/maingui.hpp b/src/ftinspect/maingui.hpp
index 13d0503..940fe7f 100644
--- a/src/ftinspect/maingui.hpp
+++ b/src/ftinspect/maingui.hpp
@@ -65,6 +65,8 @@ public:
 
 protected:
   void closeEvent(QCloseEvent*);
+  void dragEnterEvent(QDragEnterEvent* event);
+  void dropEvent(QDropEvent* event);
 
 private slots:
   void about();
@@ -197,6 +199,8 @@ private:
     Units_pt
   };
 
+  void openFonts(QStringList const& fileNames);
+
   void syncSettings();
   void clearStatusBar();
 
@@ -206,6 +210,7 @@ private:
   void createMenus();
   void createStatusBar();
   void setGraphicsDefaults();
+  void setupDragDrop();
 
   void readSettings();
   void writeSettings();