Fixes crash #504

chatterino.pro

@@ -381,7 +381,8 @@ HEADERS  += \
     src/util/clamp.hpp \
     src/widgets/label.hpp \
     src/util/combine_path.hpp \
-    src/widgets/settingspages/browserextensionpage.hpp
+    src/widgets/settingspages/browserextensionpage.hpp \
+    src/nullableptr.hpp
 
 RESOURCES += \
     resources/resources.qrc

src/nullableptr.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+namespace chatterino {
+
+template <typename T>
+class NullablePtr
+{
+public:
+    NullablePtr()
+        : element_(nullptr)
+    {
+    }
+
+    NullablePtr(T *element)
+        : element_(element)
+    {
+    }
+
+    T *operator->() const
+    {
+        assert(this->hasElement());
+
+        return element_;
+    }
+
+    T &operator*() const
+    {
+        assert(this->hasElement());
+
+        return *element_;
+    }
+
+    T *get() const
+    {
+        assert(this->hasElement());
+
+        return this->element_;
+    }
+
+    bool isNull() const
+    {
+        return this->element_ == nullptr;
+    }
+
+    bool hasElement() const
+    {
+        return this->element_ != nullptr;
+    }
+
+    operator bool() const
+    {
+        return this->hasElement();
+    }
+
+private:
+    T *element_;
+};
+
+}  // namespace chatterino

src/widgets/selectchanneldialog.cpp

@@ -16,8 +16,8 @@
 namespace chatterino {
 namespace widgets {
 
-SelectChannelDialog::SelectChannelDialog()
-    : BaseWindow((QWidget *)nullptr, BaseWindow::EnableCustomFrame)
+SelectChannelDialog::SelectChannelDialog(QWidget *parent)
+    : BaseWindow(parent, BaseWindow::EnableCustomFrame)
     , selectedChannel(Channel::getEmpty())
 {
     this->setWindowTitle("Select a channel to join");

src/widgets/selectchanneldialog.hpp

@@ -15,7 +15,7 @@ namespace widgets {
 class SelectChannelDialog : public BaseWindow
 {
 public:
-    SelectChannelDialog();
+    SelectChannelDialog(QWidget *parent = nullptr);
 
     void setSelectedChannel(IndirectChannel selectedChannel);
     IndirectChannel getSelectedChannel() const;

src/widgets/split.cpp

@@ -45,7 +45,7 @@ pajlada::Signals::Signal<Qt::KeyboardModifiers> Split::modifierStatusChanged;
 Qt::KeyboardModifiers Split::modifierStatus = Qt::NoModifier;
 
 Split::Split(SplitContainer *parent)
-    : Split((QWidget *)parent)
+    : Split(static_cast<QWidget *>(parent))
 {
     this->container = parent;
 }
@@ -232,7 +232,13 @@ bool Split::getModerationMode() const
 void Split::showChangeChannelPopup(const char *dialogTitle, bool empty,
                                    std::function<void(bool)> callback)
 {
-    SelectChannelDialog *dialog = new SelectChannelDialog();
+    if (this->selectChannelDialog.hasElement()) {
+        this->selectChannelDialog->raise();
+
+        return;
+    }
+
+    SelectChannelDialog *dialog = new SelectChannelDialog(this);
     if (!empty) {
         dialog->setSelectedChannel(this->getIndirectChannel());
     }
@@ -247,7 +253,9 @@ void Split::showChangeChannelPopup(const char *dialogTitle, bool empty,
         }
 
         callback(dialog->hasSeletedChannel());
+        this->selectChannelDialog = nullptr;
     });
+    this->selectChannelDialog = dialog;
 }
 
 void Split::layoutMessages()
@@ -362,6 +370,7 @@ void Split::doCloseSplit()
 void Split::doChangeChannel()
 {
     this->showChangeChannelPopup("Change channel", false, [](bool) {});
+
     auto popup = this->findChildren<QDockWidget *>();
     if (popup.size() && popup.at(0)->isVisible() && !popup.at(0)->isFloating()) {
         popup.at(0)->hide();

src/widgets/split.hpp

@@ -5,6 +5,7 @@
 #include "messages/layouts/messagelayoutelement.hpp"
 #include "messages/limitedqueuesnapshot.hpp"
 #include "messages/messageelement.hpp"
+#include "nullableptr.hpp"
 #include "util/serialize-custom.hpp"
 #include "widgets/basewidget.hpp"
 #include "widgets/helper/channelview.hpp"
@@ -22,6 +23,7 @@ namespace widgets {
 
 class SplitContainer;
 class SplitOverlay;
+class SelectChannelDialog;
 
 // Each ChatWidget consists of three sub-elements that handle their own part of the chat widget:
 // ChatWidgetHeader
@@ -96,6 +98,8 @@ private:
     SplitInput input;
     SplitOverlay *overlay;
 
+    NullablePtr<SelectChannelDialog> selectChannelDialog;
+
     bool moderationMode = false;
 
     bool isMouseOver = false;