Update styles previews in Idle

This helps with performance when we do series of actions
updating styles. In that case we will only request update.
When we will reach idle state we will do it only one time.
What removes unnecessary updates in the meantime.

Change-Id: I9fc59992833a6cf98c42571c1189b3c5d49ba5a0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/126840
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>

2 files changed, 37 insertions, 7 deletions

diff --git a/svx/source/inc/StylesPreviewWindow.hxx b/svx/source/inc/StylesPreviewWindow.hxx
index 4c7fdd43dfa5..ec019608d46a 100644
--- a/svx/source/inc/StylesPreviewWindow.hxx
+++ b/svx/source/inc/StylesPreviewWindow.hxx
@@ -79,8 +79,25 @@ private:
                                       const tools::Rectangle& aContentRect, const Color& aColor);
 };
 
+class StylesListUpdateTask : public Idle
+{
+    StylesPreviewWindow_Base& m_rStylesList;
+
+public:
+    StylesListUpdateTask(StylesPreviewWindow_Base& rStylesList)
+        : Idle("StylesListUpdateTask")
+        , m_rStylesList(rStylesList)
+    {
+        SetPriority(TaskPriority::HIGH_IDLE);
+    }
+
+    virtual void Invoke() override;
+};
+
 class StylesPreviewWindow_Base
 {
+    friend class StylesListUpdateTask;
+
 protected:
     static constexpr unsigned STYLES_COUNT = 6;
 
@@ -88,6 +105,8 @@ protected:
 
     std::unique_ptr<weld::IconView> m_xStylesView;
 
+    StylesListUpdateTask m_aUpdateTask;
+
     StyleStatusListener* m_pStatusListener;
     css::uno::Reference<css::lang::XComponent> m_xStatusListener;
     std::unique_ptr<StylePoolChangeListener> m_pStylePoolChangeListener;
@@ -108,10 +127,11 @@ public:
     ~StylesPreviewWindow_Base();
 
     void Select(const OUString& rStyleName);
-    void UpdateStylesList();
+    void RequestStylesListUpdate();
 
 private:
-    void Update();
+    void UpdateStylesList();
+    void UpdateSelection();
     bool Command(const CommandEvent& rEvent);
 };
 
diff --git a/svx/source/tbxctrls/StylesPreviewWindow.cxx b/svx/source/tbxctrls/StylesPreviewWindow.cxx
index b557aade7ce3..a45289e15348 100644
--- a/svx/source/tbxctrls/StylesPreviewWindow.cxx
+++ b/svx/source/tbxctrls/StylesPreviewWindow.cxx
@@ -102,7 +102,7 @@ StylePoolChangeListener::~StylePoolChangeListener()
 
 void StylePoolChangeListener::Notify(SfxBroadcaster& /*rBC*/, const SfxHint& /*rHint*/)
 {
-    m_pPreviewControl->UpdateStylesList();
+    m_pPreviewControl->RequestStylesListUpdate();
 }
 
 StyleItemController::StyleItemController(const std::pair<OUString, OUString>& aStyleName)
@@ -373,6 +373,7 @@ StylesPreviewWindow_Base::StylesPreviewWindow_Base(
     const css::uno::Reference<css::frame::XDispatchProvider>& xDispatchProvider)
     : m_xDispatchProvider(xDispatchProvider)
     , m_xStylesView(xBuilder.weld_icon_view("stylesview"))
+    , m_aUpdateTask(*this)
     , m_aDefaultStyles(aDefaultStyles)
 {
     m_xStylesView->connect_selection_changed(LINK(this, StylesPreviewWindow_Base, Selected));
@@ -384,8 +385,7 @@ StylesPreviewWindow_Base::StylesPreviewWindow_Base(
 
     m_pStylePoolChangeListener.reset(new StylePoolChangeListener(this));
 
-    UpdateStylesList();
-    Update();
+    RequestStylesListUpdate();
 }
 
 IMPL_LINK(StylesPreviewWindow_Base, Selected, weld::IconView&, rIconView, void)
@@ -425,6 +425,8 @@ StylesPreviewWindow_Base::~StylesPreviewWindow_Base()
 {
     m_pStatusListener->UnBind();
 
+    m_aUpdateTask.Stop();
+
     try
     {
         m_xStatusListener->dispose();
@@ -440,10 +442,10 @@ void StylesPreviewWindow_Base::Select(const OUString& rStyleName)
 {
     m_sSelectedStyle = rStyleName;
 
-    Update();
+    UpdateSelection();
 }
 
-void StylesPreviewWindow_Base::Update()
+void StylesPreviewWindow_Base::UpdateSelection()
 {
     for (unsigned long i = 0; i < m_aAllStyles.size(); ++i)
     {
@@ -455,6 +457,14 @@ void StylesPreviewWindow_Base::Update()
     }
 }
 
+void StylesPreviewWindow_Base::RequestStylesListUpdate() { m_aUpdateTask.Start(); }
+
+void StylesListUpdateTask::Invoke()
+{
+    m_rStylesList.UpdateStylesList();
+    m_rStylesList.UpdateSelection();
+}
+
 void StylesPreviewWindow_Base::UpdateStylesList()
 {
     m_aAllStyles = m_aDefaultStyles;