[LyX/master] #11682 open new window on Mac if there is none and LyX is activated via dock

[Stephan Witt]

commit 4d4dc96b0698de7368e0e63c7c27e1e5d7913a7f
Author: Stephan Witt <sw...@lyx.org>
Date:   Sun Feb 7 18:53:11 2021 +0100

    #11682 open new window on Mac if there is none and LyX is activated via dock
---
 src/frontends/qt/GuiApplication.cpp |   38 ++++++++++++++++++++++++++++++++++-
 src/frontends/qt/GuiApplication.h   |    4 +++
 2 files changed, 41 insertions(+), 1 deletions(-)

diff --git a/src/frontends/qt/GuiApplication.cpp 
b/src/frontends/qt/GuiApplication.cpp
index 8160e39..625d85b 100644
--- a/src/frontends/qt/GuiApplication.cpp
+++ b/src/frontends/qt/GuiApplication.cpp
@@ -944,7 +944,7 @@ public:
 struct GuiApplication::Private
 {
        Private(): language_model_(nullptr), meta_fake_bit(NoModifier),
-               global_menubar_(nullptr)
+               global_menubar_(nullptr), last_state_(Qt::ApplicationInactive)
        {
        #if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
        #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
@@ -1011,6 +1011,8 @@ struct GuiApplication::Private
 
        /// Only used on mac.
        QMenuBar * global_menubar_;
+       /// Holds previous application state on Mac
+       Qt::ApplicationState last_state_;
 
 #ifdef Q_OS_MAC
        /// Linkback mime handler for MacOSX.
@@ -1084,6 +1086,10 @@ GuiApplication::GuiApplication(int & argc, char ** argv)
        setupApplescript();
        appleCleanupEditMenu();
        appleCleanupViewMenu();
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+       connect(this, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
+                       this, 
SLOT(onApplicationStateChanged(Qt::ApplicationState)));
+#endif
 #endif
 
 #if defined(Q_WS_X11) || defined(QPA_XCB)
@@ -3293,6 +3299,36 @@ void GuiApplication::onLastWindowClosed()
 }
 
 
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 1, 0))
+void GuiApplication::onApplicationStateChanged(Qt::ApplicationState state)
+{
+       std::string name = "unknown";
+       switch (state) {
+       case Qt::ApplicationSuspended:
+               name = "ApplicationSuspended";
+               break;
+       case Qt::ApplicationHidden:
+               name = "ApplicationHidden";
+               break;
+       case Qt::ApplicationInactive:
+               name = "ApplicationInactive";
+               break;
+       case Qt::ApplicationActive:
+               name = "ApplicationActive";
+               /// The Dock icon click produces 2 sequential 
QEvent::ApplicationStateChangeEvent events.
+               /// cmd+tab only one QEvent::ApplicationStateChangeEvent event
+               if (d->views_.empty() && d->last_state_ == state) {
+                       LYXERR(Debug::GUI, "Open new window...");
+                       createView();
+               }
+               break;
+       }
+       LYXERR(Debug::GUI, "onApplicationStateChanged..." << name);
+       d->last_state_ = state;
+}
+#endif
+
+
 void GuiApplication::startLongOperation() {
        d->key_checker_.start();
 }
diff --git a/src/frontends/qt/GuiApplication.h 
b/src/frontends/qt/GuiApplication.h
index 148d20f..8afdd7f 100644
--- a/src/frontends/qt/GuiApplication.h
+++ b/src/frontends/qt/GuiApplication.h
@@ -228,6 +228,10 @@ private Q_SLOTS:
        void onLocaleChanged();
        ///
        void slotProcessFuncRequestQueue() { processFuncRequestQueue(); }
+       ///
+#if (QT_VERSION >= 0x050100)
+       void onApplicationStateChanged(Qt::ApplicationState state);
+#endif
 
 private:
        ///
-- 
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