Show estimated print time in the ruler (#2305)

* Calculate tick by mouse hover position

* Draw hover tick

* Show hover layer time

* Make sure hovered tick get updated immediately

src/slic3r/GUI/IMSlider.cpp

@@ -6,6 +6,7 @@
 #define IMGUI_DEFINE_MATH_OPERATORS
 #endif
 #include <imgui/imgui_internal.h>
+#include <boost/algorithm/string/replace.hpp>
 
 namespace Slic3r {
 
@@ -662,10 +663,8 @@ void IMSlider::draw_ticks(const ImRect& slideable_region) {
             ImGui::RenderFrame(right_hover_box.Min, right_hover_box.Max, tick_hover_box_clr, false);
 
             show_tooltip(*tick_it);
-            if (context.IO.MouseClicked[0]) {
+            m_tick_value = tick_it->tick;
-                m_tick_value = tick_it->tick;
+            m_tick_rect = ImVec4(tick_hover_box.Min.x, tick_hover_box.Min.y, tick_hover_box.Max.x, tick_hover_box.Max.y);
-                m_tick_rect = ImVec4(tick_hover_box.Min.x, tick_hover_box.Min.y, tick_hover_box.Max.x, tick_hover_box.Max.y);
-            }
         }
         ++tick_it;
     }
@@ -746,6 +745,51 @@ void IMSlider::show_tooltip(const TickCode& tick){
     }
 }
 
+int IMSlider::get_tick_near_point(int v_min, int v_max, const ImVec2& pt, const ImRect& rect) {
+    ImS32 v_range = (v_min < v_max ? v_max - v_min : v_min - v_max);
+    
+    const ImGuiAxis axis = is_horizontal() ? ImGuiAxis_X : ImGuiAxis_Y;
+    const float region_usable_sz = (rect.Max[axis] - rect.Min[axis]);
+    const float region_usable_pos_min = rect.Min[axis];
+    
+    const float abs_pos = pt[axis];
+    
+    float pos_ratio = (region_usable_sz > 0.0f) ? ImClamp((abs_pos - region_usable_pos_min) / region_usable_sz, 0.0f, 1.0f) : 0.0f;
+    if (axis == ImGuiAxis_Y)
+        pos_ratio = 1.0f - pos_ratio;
+    
+    return v_min + (ImS32)(v_range * pos_ratio + 0.5f);
+}
+
+void IMSlider::draw_tick_on_mouse_position(const ImRect& slideable_region) {
+    int v_min = GetMinValue();
+    int v_max = GetMaxValue();
+    ImGuiContext& context = *GImGui;
+    
+    int tick = get_tick_near_point(v_min, v_max, context.IO.MousePos, slideable_region);
+
+//    if (tick == v_min || tick == v_max) {
+//        return;
+//    }
+    
+    //draw tick
+    ImVec2 tick_offset   = ImVec2(22.0f, 14.0f) * m_scale;
+    float  tick_width    = 1.0f * m_scale;
+
+    const ImU32 tick_clr = IM_COL32(144, 144, 144, 255);
+
+    float tick_pos = get_pos_from_value(v_min, v_max, tick, slideable_region);
+    ImRect tick_left  = ImRect(slideable_region.GetCenter().x - tick_offset.x, tick_pos - tick_width, slideable_region.GetCenter().x - tick_offset.y, tick_pos);
+    ImRect tick_right = ImRect(slideable_region.GetCenter().x + tick_offset.y, tick_pos - tick_width, slideable_region.GetCenter().x + tick_offset.x, tick_pos);
+    ImGui::RenderFrame(tick_left.Min, tick_left.Max, tick_clr, false);
+    ImGui::RenderFrame(tick_right.Min, tick_right.Max, tick_clr, false);
+    
+    // draw layer time
+    std::string label = get_label(tick, ltEstimatedTime);
+    boost::ireplace_all(label, "\n", "");
+    show_tooltip(label);
+}
+
 bool IMSlider::vertical_slider(const char* str_id, int* higher_value, int* lower_value, std::string& higher_label, std::string& lower_label,int v_min, int v_max, const ImVec2& size, SelectedSlider& selection, bool one_layer_flag, float scale)
 {
     ImGuiWindow* window = ImGui::GetCurrentWindow();
@@ -914,6 +958,11 @@ bool IMSlider::vertical_slider(const char* str_id, int* higher_value, int* lower
         pos_3 = pos_1 + triangle_offsets[2];
         window->DrawList->AddTriangleFilled(pos_1, pos_2, pos_3, white_bg);
         ImGui::RenderText(text_start + text_padding, lower_label.c_str());
+        
+        // draw mouse position
+        if (hovered) {
+            draw_tick_on_mouse_position(h_selected ? higher_slideable_region : lower_slideable_region);
+        }
     }
     if (one_layer_flag) 
     {
@@ -953,6 +1002,11 @@ bool IMSlider::vertical_slider(const char* str_id, int* higher_value, int* lower
         ImRect text_rect = ImRect(text_start, text_start + text_size);
         ImGui::RenderFrame(text_rect.Min, text_rect.Max, white_bg, false, text_frame_rounding);
         ImGui::RenderText(text_start + text_padding, higher_label.c_str());
+        
+        // draw mouse position
+        if (hovered) {
+            draw_tick_on_mouse_position(one_slideable_region);
+        }
     }
 
     return value_changed;

src/slic3r/GUI/IMSlider.hpp

@@ -146,6 +146,7 @@ protected:
     void draw_background_and_groove(const ImRect& bg_rect, const ImRect& groove);
     void draw_colored_band(const ImRect& groove, const ImRect& slideable_region);
     void draw_ticks(const ImRect& slideable_region);
+    void draw_tick_on_mouse_position(const ImRect& slideable_region);
     void show_tooltip(const TickCode& tick); //menu
     void show_tooltip(const std::string tooltip); //menu
     bool vertical_slider(const char* str_id, int* higher_value, int* lower_value,
@@ -159,6 +160,7 @@ private:
     double get_double_value(const SelectedSlider& selection);
     int    get_tick_from_value(double value, bool force_lower_bound = false);
     float get_pos_from_value(int v_min, int v_max, int value, const ImRect& rect);
+    int    get_tick_near_point(int v_min, int v_max, const ImVec2& pt, const ImRect& rect);
 
     std::string get_color_for_tool_change_tick(std::set<TickCode>::const_iterator it) const;
     // Get active extruders for tick.