Add Timeline visibility button to Toolbar, extracted button draw logic to separate member function

data/strings/en.ini

@@ -2120,6 +2120,8 @@ jumble = Jumble Tool
 shortcut = Shortcut: {0}
 preview_hide = Hide Preview
 preview_show = Show Preview
+timeline_hide = Hide Timeline
+timeline_show = Show Timeline
 
 [undo_history]
 title = Undo History

src/app/ui/toolbar.cpp

@@ -156,6 +156,14 @@ bool ToolBar::onProcessMessage(Message* msg)
         bool state = preview->isPreviewEnabled();
         preview->setPreviewEnabled(!state);
       }
+
+      toolrc = getToolGroupBounds(TimelineVisibilityIndex);
+      if (mousePos.y >= toolrc.y &&
+          mousePos.y < toolrc.y + toolrc.h) {
+        // Toggle timeline visibility
+        bool state = App::instance()->mainWindow()->getTimelineVisibility();
+        App::instance()->mainWindow()->setTimelineVisibility(!state);
+      }
       break;
     }
 
@@ -193,6 +201,12 @@ bool ToolBar::onProcessMessage(Message* msg)
         new_hot_index = PreviewVisibilityIndex;
       }
 
+      toolrc = getToolGroupBounds(TimelineVisibilityIndex);
+      if (mousePos.y >= toolrc.y &&
+          mousePos.y < toolrc.y + toolrc.h) {
+        new_hot_index = TimelineVisibilityIndex;
+      }
+
       // hot button changed
       if (new_hot_tool != m_hotTool ||
           new_hot_index != m_hotIndex) {
@@ -299,13 +313,14 @@ void ToolBar::onPaint(ui::PaintEvent& ev)
   ToolGroupList::iterator it = toolbox->begin_group();
   int groups = toolbox->getGroupsCount();
   Rect toolrc;
+  SkinPartPtr nw;
+  os::Surface* icon;
 
   g->fillRect(theme->colors.tabActiveFace(), bounds);
 
   for (int c=0; c<groups; ++c, ++it) {
     ToolGroup* tool_group = *it;
     Tool* tool = m_selectedInGroup[tool_group];
-    SkinPartPtr nw;
 
     if (activeTool == tool || m_hotIndex == c) {
       nw = theme->parts.toolbuttonHot();
@@ -315,36 +330,28 @@ void ToolBar::onPaint(ui::PaintEvent& ev)
                                     theme->parts.toolbuttonLast();
     }
 
-    toolrc = getToolGroupBounds(c);
-    toolrc.offset(-origin());
-    theme->drawRect(g, toolrc, nw.get());
-
     // Draw the tool icon
-    os::Surface* icon = theme->getToolIcon(tool->getId().c_str());
-    if (icon) {
-      g->drawRgbaSurface(icon,
-        CALC_FOR_CENTER(toolrc.x, toolrc.w, icon->width()),
-        CALC_FOR_CENTER(toolrc.y, toolrc.h, icon->height()));
-    }
+    icon = theme->getToolIcon(tool->getId().c_str());
+    drawToolIcon(g, c, nw, icon);
   }
 
   // Draw button to show/hide preview
-  toolrc = getToolGroupBounds(PreviewVisibilityIndex);
-  toolrc.offset(-origin());
   bool isHot = (m_hotIndex == PreviewVisibilityIndex ||
     App::instance()->mainWindow()->getPreviewEditor()->isPreviewEnabled());
-  theme->drawRect(
-    g,
-    toolrc,
-    (isHot ? theme->parts.toolbuttonHot().get():
-             theme->parts.toolbuttonLast().get()));
+  nw = isHot ? theme->parts.toolbuttonHot():
+               theme->parts.toolbuttonLast();
+  icon = theme->getToolIcon("minieditor");
 
-  os::Surface* icon = theme->getToolIcon("minieditor");
-  if (icon) {
-    g->drawRgbaSurface(icon,
-      CALC_FOR_CENTER(toolrc.x, toolrc.w, icon->width()),
-      CALC_FOR_CENTER(toolrc.y, toolrc.h, icon->height()));
-  }
+  drawToolIcon(g, PreviewVisibilityIndex, nw, icon);
+
+  // Draw button to show/hide timeline
+  isHot = (m_hotIndex == TimelineVisibilityIndex ||
+    App::instance()->mainWindow()->getTimelineVisibility());
+  nw = isHot ? theme->parts.toolbuttonHot():
+               theme->parts.toolbuttonLast();
+  icon = theme->getToolIcon("minieditor");
+
+  drawToolIcon(g, TimelineVisibilityIndex, nw, icon);
 }
 
 void ToolBar::onVisible(bool visible)
@@ -457,6 +464,11 @@ Rect ToolBar::getToolGroupBounds(int group_index)
       rc.h = iconsize.h+2*guiscale();
       break;
 
+    case TimelineVisibilityIndex:
+      rc.y += rc.h - iconsize.h - iconsize.h - 2*guiscale();
+      rc.h = iconsize.h+2*guiscale();
+      break;
+
     default:
       rc.y += group_index*(iconsize.h-1*guiscale());
       rc.h = group_index < groups-1 ? iconsize.h+1*guiscale():
@@ -517,6 +529,12 @@ void ToolBar::openTipWindow(int group_index, Tool* tool)
     else
       tooltip = Strings::tools_preview_show();
   }
+  else if (group_index == TimelineVisibilityIndex) {
+    if (App::instance()->mainWindow()->getTimelineVisibility())
+      tooltip = Strings::tools_timeline_hide();
+    else
+      tooltip = Strings::tools_timeline_show();
+  }
   else
     return;
 
@@ -586,6 +604,20 @@ void ToolBar::onClosePopup()
   invalidate();
 }
 
+void ToolBar::drawToolIcon(Graphics* g, int group_index, SkinPartPtr skin, os::Surface* icon) {
+  auto theme = SkinTheme::get(this);
+  Rect toolrc = getToolGroupBounds(group_index);
+  toolrc.offset(-origin());
+
+  theme->drawRect(g, toolrc, skin.get());
+
+  if (icon) {
+    g->drawRgbaSurface(icon,
+                       CALC_FOR_CENTER(toolrc.x, toolrc.w, icon->width()),
+                       CALC_FOR_CENTER(toolrc.y, toolrc.h, icon->height()));
+  }
+}
+
 //////////////////////////////////////////////////////////////////////
 // ToolStrip
 //////////////////////////////////////////////////////////////////////

src/app/ui/toolbar.h

@@ -9,6 +9,7 @@
 #pragma once
 
 #include "app/tools/active_tool_observer.h"
+#include "app/ui/skin/skin_part.h"
 #include "gfx/point.h"
 #include "obs/connection.h"
 #include "ui/timer.h"
@@ -37,6 +38,7 @@ namespace app {
 
     static const int NoneIndex = -1;
     static const int PreviewVisibilityIndex = -2;
+    static const int TimelineVisibilityIndex = -3;
 
     ToolBar();
     ~ToolBar();
@@ -62,6 +64,7 @@ namespace app {
     gfx::Point getToolPositionInGroup(int group_index, tools::Tool* tool);
     void openTipWindow(int group_index, tools::Tool* tool);
     void onClosePopup();
+    void drawToolIcon(ui::Graphics* g, int group_index, skin::SkinPartPtr skin, os::Surface* icon);
 
     // ActiveToolObserver impl
     void onActiveToolChange(tools::Tool* tool) override;