New UI windows behavior to clear workspace on ESC

Press ESC to toggle a 'clear workspace' mode. 
Cleanup of UserInterface rendering of output preview to enable this.
Move include to internal_imgui.h outside of ImGuiToolkit.h.

ImGuiToolkit.cpp

@@ -38,6 +38,7 @@
 #include "SystemToolkit.h"
 
 #include "ImGuiToolkit.h"
+#include "imgui_internal.h"
 
 bool tooltips_enabled = true;
 unsigned int textureicons = 0;
@@ -77,7 +78,7 @@ bool ImGuiToolkit::ButtonSwitch(const char* label, bool* toggle, const char* sho
     bool ret = false;
 
     // utility style
-    ImVec4* colors = ImGui::GetStyle().Colors;
+    const ImVec4* colors = ImGui::GetStyle().Colors;
     ImDrawList* draw_list = ImGui::GetWindowDrawList();
 
     // draw position when entering
@@ -622,9 +623,10 @@ bool ImGuiToolkit::SliderTiming (const char* label, uint* ms, uint v_min, uint v
 #define LARGE_TICK_INCREMENT 1
 #define LABEL_TICK_INCREMENT 3
 
-void ImGuiToolkit::RenderTimeline (ImGuiWindow* window, ImRect timeline_bbox,
+void ImGuiToolkit::RenderTimeline (ImVec2 min_bbox, ImVec2 max_bbox, guint64 begin, guint64 end, guint64 step, bool verticalflip)
-                                   guint64 begin, guint64 end, guint64 step, bool verticalflip)
 {
+    const ImRect timeline_bbox(min_bbox, max_bbox);
+    const ImGuiWindow* window = ImGui::GetCurrentWindow();
     static guint64 optimal_tick_marks[NUM_MARKS + LABEL_TICK_INCREMENT] = { 100 * MILISECOND, 500 * MILISECOND, 1 * SECOND, 2 * SECOND, 5 * SECOND, 10 * SECOND, 20 * SECOND, 1 * MINUTE, 2 * MINUTE, 5 * MINUTE, 10 * MINUTE, 60 * MINUTE, 60 * MINUTE };
 
     const ImGuiContext& g = *GImGui;
@@ -759,13 +761,14 @@ void ImGuiToolkit::RenderTimeline (ImGuiWindow* window, ImRect timeline_bbox,
 }
 
 
-void ImGuiToolkit::RenderTimelineBPM (ImGuiWindow* window, ImRect timeline_bbox, double tempo, double quantum,
+void ImGuiToolkit::RenderTimelineBPM (ImVec2 min_bbox, ImVec2 max_bbox, double tempo, double quantum,
                                       guint64 begin, guint64 end, guint64 step, bool verticalflip)
 {
     if (tempo<1.)
         return;
 
-
+    const ImRect timeline_bbox(min_bbox, max_bbox);
+    const ImGuiWindow* window = ImGui::GetCurrentWindow();
     const ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
     const float fontsize = g.FontSize;
@@ -986,9 +989,9 @@ bool ImGuiToolkit::TimelineSlider (const char* label, guint64 *time, guint64 beg
 
     // render the timeline
     if (tempo > 0 && quantum > 0)
-        RenderTimelineBPM(window, timeline_bbox, tempo, quantum, begin, end, step);
+        RenderTimelineBPM(timeline_bbox.Min, timeline_bbox.Max, tempo, quantum, begin, end, step);
     else
-        RenderTimeline(window, timeline_bbox, begin, end, step);
+        RenderTimeline(timeline_bbox.Min, timeline_bbox.Max, begin, end, step);
 
     // draw slider grab handle
     if (grab_slider_bb.Max.x > grab_slider_bb.Min.x) {

ImGuiToolkit.h

@@ -9,7 +9,6 @@
 #ifndef IMGUI_DEFINE_MATH_OPERATORS
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
-#include "imgui_internal.h"
 
 #include "rsc/fonts/IconsFontAwesome5.h"
 
@@ -47,8 +46,8 @@ namespace ImGuiToolkit
     // sliders
     bool SliderTiming (const char* label, uint *ms, uint v_min, uint v_max, uint v_step, const char* text_max = nullptr);
     bool TimelineSlider (const char* label, guint64 *time, guint64 begin, guint64 first, guint64 end, guint64 step, const float width, double tempo = 0, double quantum = 0);
-    void RenderTimeline (struct ImGuiWindow* window, struct ImRect timeline_bbox, guint64 begin, guint64 end, guint64 step, bool verticalflip = false);
+    void RenderTimeline (ImVec2 min_bbox, ImVec2 max_bbox, guint64 begin, guint64 end, guint64 step, bool verticalflip = false);
-    void RenderTimelineBPM (struct ImGuiWindow* window, struct ImRect timeline_bbox, double tempo, double quantum, guint64 begin, guint64 end, guint64 step, bool verticalflip = false);
+    void RenderTimelineBPM (ImVec2 min_bbox, ImVec2 max_bbox, double tempo, double quantum, guint64 begin, guint64 end, guint64 step, bool verticalflip = false);
     bool InvisibleSliderInt(const char* label, uint *index, uint min, uint max, const ImVec2 size);
     bool EditPlotLines(const char* label, float *array, int values_count, float values_min, float values_max, const ImVec2 size);
     bool EditPlotHistoLines(const char* label, float *histogram_array, float *lines_array, int values_count, float values_min, float values_max, guint64 begin, guint64 end, bool cut, bool *released, const ImVec2 size);

ImGuiVisitor.cpp

@@ -31,6 +31,9 @@
 #include <tinyxml2.h>
 #include "tinyxml2Toolkit.h"
 
+#include "imgui.h"
+#include "imgui_internal.h"
+
 #include "defines.h"
 #include "Log.h"
 #include "Scene.h"

UserInterfaceManager.h

@@ -202,9 +202,28 @@ public:
 
 };
 
-class SourceController
+class WorkspaceWindow
+{
+    static bool clear_workspace_enabled;
+    static std::list<WorkspaceWindow *> windows_;
+
+public:
+    WorkspaceWindow(const char* name);
+
+    static void toggleClearRestoreWorkspace();
+    static void clearWorkspace();
+    static void restoreWorkspace(bool instantaneous = false);
+
+protected:
+
+    virtual void Update();
+
+    const char *name_;
+    struct ImGuiProperties *impl_;
+};
+
+class SourceController : public WorkspaceWindow
 {
-    bool focused_;
     float min_width_;
     float h_space_;
     float v_space_;
@@ -253,48 +272,48 @@ public:
 
     inline void Play()   { play_toggle_request_  = true; }
     inline void Replay() { replay_request_= true; }
-    void Update();
-
     void resetActiveSelection();
-    void Render();
+
     void setVisible(bool on);
     bool Visible() const;
-    inline bool Foccused() const { return focused_; }
+    void Render();
+
+    // from WorkspaceWindow
+    void Update() override;
 };
 
-
+class OutputPreview : public WorkspaceWindow
-class UserInterface
 {
-    friend class Navigator;
-    Navigator navigator;
-    ToolBox toolbox;
-    SourceController sourcecontrol;
-    HelperToolbox sessiontoolbox;
-
-    uint64_t start_time;
-    bool ctrl_modifier_active;
-    bool alt_modifier_active;
-    bool shift_modifier_active;
-    bool show_vimix_about;
-    bool show_imgui_about;
-    bool show_gst_about;
-    bool show_opengl_about;
-    int  show_view_navigator;
-    int  target_view_navigator;
-    unsigned int screenshot_step;
-    bool pending_save_on_exit;
-
     // frame grabbers
     VideoRecorder *video_recorder_;
+    // delayed trigger for recording
+    std::vector< std::future<VideoRecorder *> > _video_recorders;
 
 #if defined(LINUX)
     FrameGrabber *webcam_emulator_;
 #endif
 
-    // Dialogs
+    // dialog to select record location
-    DialogToolkit::OpenSessionDialog *sessionopendialog;
+    DialogToolkit::OpenFolderDialog *recordFolderDialog;
-    DialogToolkit::OpenSessionDialog *sessionimportdialog;
+
-    DialogToolkit::SaveSessionDialog *sessionsavedialog;
+public:
+    OutputPreview();
+
+    void ToggleRecord(bool save_and_continue = false);
+    inline bool isRecording() const { return video_recorder_ != nullptr; }
+
+    void Render();
+    void setVisible(bool on);
+    bool Visible() const;
+
+    // from WorkspaceWindow
+    void Update() override;
+};
+
+class UserInterface
+{
+    friend class Navigator;
+    friend class OutputPreview;
 
     // Private Constructor
     UserInterface();
@@ -336,10 +355,35 @@ public:
     void fillShaderEditor(const std::string &text);
 
     void StartScreenshot();
-    inline bool isRecording() const { return video_recorder_ != nullptr; }
 
 protected:
 
+    // internal
+    uint64_t start_time;
+    bool ctrl_modifier_active;
+    bool alt_modifier_active;
+    bool shift_modifier_active;
+    bool show_vimix_about;
+    bool show_imgui_about;
+    bool show_gst_about;
+    bool show_opengl_about;
+    int  show_view_navigator;
+    int  target_view_navigator;
+    unsigned int screenshot_step;
+    bool pending_save_on_exit;
+
+    // Dialogs
+    DialogToolkit::OpenSessionDialog *sessionopendialog;
+    DialogToolkit::OpenSessionDialog *sessionimportdialog;
+    DialogToolkit::SaveSessionDialog *sessionsavedialog;
+
+    // objects and windows
+    Navigator navigator;
+    ToolBox toolbox;
+    SourceController sourcecontrol;
+    OutputPreview outputcontrol;
+    HelperToolbox sessiontoolbox;
+
     void showMenuFile();
     void showMenuEdit();
     bool saveOrSaveAs(bool force_versioning = false);
@@ -347,7 +391,6 @@ protected:
     void selectOpenFilename();
 
     void RenderMetrics (bool* p_open, int* p_corner, int *p_mode);
-    void RenderPreview();
     void RenderTimer();
     void RenderShaderEditor();
     int  RenderViewNavigator(int* shift);