implemented pausing on hover

src/widgets/helper/ChannelView.hpp

@@ -13,6 +13,7 @@
 #include <QWidget>
 #include <pajlada/signals/signal.hpp>
 
+#include <unordered_map>
 #include <unordered_set>
 
 namespace chatterino {
@@ -21,6 +22,12 @@ enum class HighlightState;
 class Channel;
 using ChannelPtr = std::shared_ptr<Channel>;
 
+struct Message;
+using MessagePtr = std::shared_ptr<const Message>;
+
+enum class MessageFlag : uint16_t;
+using MessageFlags = FlagsEnum<MessageFlag>;
+
 class MessageLayout;
 using MessageLayoutPtr = std::shared_ptr<MessageLayout>;
 
@@ -32,6 +39,14 @@ class EffectLabel;
 struct Link;
 class MessageLayoutElement;
 
+enum class PauseReason {
+    Mouse,
+    Selection,
+    DoubleClick,
+};
+
+using SteadyClock = std::chrono::steady_clock;
+
 class ChannelView final : public BaseWidget
 {
     Q_OBJECT
@@ -48,12 +63,15 @@ public:
     bool getEnableScrollingToBottom() const;
     void setOverrideFlags(boost::optional<MessageElementFlags> value);
     const boost::optional<MessageElementFlags> &getOverrideFlags() const;
-    void pause(int msecTimeout);
     void updateLastReadMessage();
 
+    bool paused() const;
+    void pause(PauseReason reason, boost::optional<uint> msecs = boost::none);
+    void unpause(PauseReason reason);
+
     void setChannel(ChannelPtr channel_);
     LimitedQueueSnapshot<MessageLayoutPtr> getMessagesSnapshot();
-    void layoutMessages();
+    void queueLayout();
 
     void clearMessages();
     void showUserInfoPopup(const QString &userName);
@@ -94,18 +112,23 @@ private:
     void initializeScrollbar();
     void initializeSignals();
 
-    // void messageAppended(MessagePtr &message);
-    // void messageAddedAtStart(std::vector<MessagePtr> &messages);
-    // void messageRemoveFromStart(MessagePtr &message);
+    void messageAppended(MessagePtr &message,
+                         boost::optional<MessageFlags> overridingFlags);
+    void messageAddedAtStart(std::vector<MessagePtr> &messages);
+    void messageRemoveFromStart(MessagePtr &message);
+    void messageReplaced(size_t index, MessagePtr &replacement);
 
-    void updatePauseStatus();
     void detachChannel();
-    void actuallyLayoutMessages(bool causedByScollbar = false);
+
+    void performLayout(bool causedByScollbar = false);
+    void layoutVisibleMessages(
+        LimitedQueueSnapshot<MessageLayoutPtr> &messages);
+    void updateScrollbar(LimitedQueueSnapshot<MessageLayoutPtr> &messages,
+                         bool causedByScrollbar);
 
     void drawMessages(QPainter &painter);
     void setSelection(const SelectionItem &start, const SelectionItem &end);
     MessageElementFlags getFlags() const;
-    bool isPaused();
     void selectWholeMessage(MessageLayout *layout, int &messageIndex);
     void getWordBounds(MessageLayout *layout,
                        const MessageLayoutElement *element,
@@ -117,6 +140,7 @@ private:
     void addContextMenuItems(const MessageLayoutElement *hoveredElement,
                              MessageLayout *layout);
     int getLayoutWidth() const;
+    void updatePauseTimer();
 
     QTimer *layoutCooldown_;
     bool layoutQueued_;
@@ -126,12 +150,11 @@ private:
     bool messageWasAdded_ = false;
     bool lastMessageHasAlternateBackground_ = false;
 
-    bool pausedTemporarily_ = false;
-    bool pausedBySelection_ = false;
-    bool pausedByScrollingUp_ = false;
-    int messagesAddedSinceSelectionPause_ = 0;
+    QTimer pauseTimer_;
+    std::unordered_map<PauseReason, boost::optional<SteadyClock::time_point>>
+        pauses_;
+    boost::optional<SteadyClock::time_point> pauseEnd;
 
-    QTimer pauseTimeout_;
     boost::optional<MessageElementFlags> overrideFlags_;
     MessageLayoutPtr lastReadMessage_;
 
@@ -179,7 +202,7 @@ private:
 private slots:
     void wordFlagsChanged()
     {
-        layoutMessages();
+        queueLayout();
         update();
     }
 };