Disable zoom in/out buttons when threshold is reached (#12676)

diff --git a/src/frontends/qt/GuiView.cpp b/src/frontends/qt/GuiView.cpp
index 461b09cfd58610eae312768af92cd4f839a5997b..f7222e402ecdf30db9cc484da1351414498691bd 100644 (file)
--- a/src/frontends/qt/GuiView.cpp
+++ b/src/frontends/qt/GuiView.cpp
@@ -692,10 +692,12 @@ GuiView::GuiView(int id)
        zoom_out_->setAlignment(Qt::AlignCenter);
 
        statusBar()->addPermanentWidget(zoom_out_);
-       zoom_out_->setEnabled(currentBufferView());
+       zoom_out_->setEnabled(currentBufferView()
+                             && zoom_slider_->value() > zoom_slider_->minimum());
        statusBar()->addPermanentWidget(zoom_slider_);
        zoom_slider_->setEnabled(currentBufferView());
-       zoom_in_->setEnabled(currentBufferView());
+       zoom_in_->setEnabled(currentBufferView()
+                            && zoom_slider_->value() < zoom_slider_->maximum());
        statusBar()->addPermanentWidget(zoom_in_);
 
        connect(zoom_slider_, SIGNAL(sliderMoved(int)), this, SLOT(zoomSliderMoved(int)));
@@ -829,6 +831,10 @@ void GuiView::zoomSliderMoved(int value)
        dispatch(FuncRequest(LFUN_BUFFER_ZOOM, convert<string>(value)), dr);
        scheduleRedrawWorkAreas();
        zoom_value_->setText(toqstr(bformat(_("[[ZOOM]]%1$d%"), value)));
+       zoom_in_->setEnabled(currentBufferView()
+                            && value < zoom_slider_->maximum());
+       zoom_out_->setEnabled(currentBufferView()
+                             && value > zoom_slider_->minimum());
 }
 
 
@@ -1011,6 +1017,8 @@ void GuiView::setCurrentZoom(const int v)
 {
        lyxrc.currentZoom = v;
        zoom_value_->setText(toqstr(bformat(_("[[ZOOM]]%1$d%"), v)));
+       zoom_in_->setEnabled(currentBufferView() && v < zoom_slider_->maximum());
+       zoom_out_->setEnabled(currentBufferView() && v > zoom_slider_->minimum());
        Q_EMIT currentZoomChanged(v);
 }
 
@@ -1560,8 +1568,10 @@ void GuiView::onBufferViewChanged()
        updateDialogs();
        zoom_slider_->setEnabled(currentBufferView());
        zoom_value_->setEnabled(currentBufferView());
-       zoom_in_->setEnabled(currentBufferView());
-       zoom_out_->setEnabled(currentBufferView());
+       zoom_in_->setEnabled(currentBufferView()
+                            && zoom_slider_->value() < zoom_slider_->maximum());
+       zoom_out_->setEnabled(currentBufferView()
+                             && zoom_slider_->value() > zoom_slider_->minimum());
 }