Profiler: Allow scaling the timeline with Ctrl+MouseWheel :^)

Userland/DevTools/Profiler/TimelineContainer.cpp

@@ -20,6 +20,11 @@ TimelineContainer::TimelineContainer(GUI::Widget& header_container, TimelineView
     timeline_view.move_to_back();
     update_widget_sizes();
     update_widget_positions();
+
+    m_timeline_view->on_scale_change = [this] {
+        update_widget_positions();
+        update_widget_sizes();
+    };
 }
 
 TimelineContainer::~TimelineContainer()

Userland/DevTools/Profiler/TimelineTrack.cpp

@@ -22,7 +22,7 @@ TimelineTrack::TimelineTrack(TimelineView const& view, Profile const& profile, P
     set_fill_with_background_color(true);
     set_background_role(Gfx::ColorRole::Base);
     set_fixed_height(40);
-    set_fixed_width(m_profile.length_in_ms() / 10);
+    set_scale(view.scale());
     set_frame_thickness(1);
 }
 
@@ -30,6 +30,11 @@ TimelineTrack::~TimelineTrack()
 {
 }
 
+void TimelineTrack::set_scale(float scale)
+{
+    set_fixed_width(m_profile.length_in_ms() / scale);
+}
+
 void TimelineTrack::event(Core::Event& event)
 {
     switch (event.type()) {

Userland/DevTools/Profiler/TimelineTrack.h

@@ -20,6 +20,8 @@ class TimelineTrack final : public GUI::Frame {
 public:
     virtual ~TimelineTrack() override;
 
+    void set_scale(float);
+
 private:
     virtual void event(Core::Event&) override;
     virtual void paint_event(GUI::PaintEvent&) override;

Userland/DevTools/Profiler/TimelineView.cpp

@@ -6,6 +6,7 @@
 
 #include "TimelineView.h"
 #include "Profile.h"
+#include "TimelineTrack.h"
 #include <LibGUI/BoxLayout.h>
 
 namespace Profiler {
@@ -62,4 +63,18 @@ void TimelineView::mouseup_event(GUI::MouseEvent& event)
         m_profile.clear_timestamp_filter_range();
 }
 
+void TimelineView::mousewheel_event(GUI::MouseEvent& event)
+{
+    if (event.modifiers() == Mod_Ctrl) {
+        event.accept();
+        m_scale += event.wheel_delta();
+        m_scale = clamp(m_scale, 1.0f, 100.0f);
+        for_each_child_of_type<TimelineTrack>([&](auto& track) {
+            track.set_scale(m_scale);
+            return IterationDecision::Continue;
+        });
+        on_scale_change();
+    }
+}
+
 }

Userland/DevTools/Profiler/TimelineView.h

@@ -20,6 +20,9 @@ public:
     virtual ~TimelineView() override;
 
     Function<void()> on_selection_change;
+    Function<void()> on_scale_change;
+
+    float scale() const { return m_scale; }
 
     bool is_selecting() const { return m_selecting; }
     u64 select_start_time() const { return m_select_start_time; }
@@ -65,6 +68,7 @@ private:
     virtual void mousedown_event(GUI::MouseEvent&) override;
     virtual void mousemove_event(GUI::MouseEvent&) override;
     virtual void mouseup_event(GUI::MouseEvent&) override;
+    virtual void mousewheel_event(GUI::MouseEvent&) override;
 
     explicit TimelineView(Profile&);
 
@@ -75,6 +79,7 @@ private:
     u64 m_select_start_time { 0 };
     u64 m_select_end_time { 0 };
     u64 m_hover_time { 0 };
+    float m_scale { 10 };
 };
 
 }