From 9b9dc2b870b433d11017201562480361e0a94a73 Mon Sep 17 00:00:00 2001
From: Michael Zhou <myz227@nyu.edu>
Date: Fri, 2 Aug 2019 14:45:07 -0700
Subject: [PATCH] Added mouse click events for feature selection

---
 src/ui/selection_plugin.cpp | 22 ++++++++++++++++++++++
 src/ui/selection_plugin.h   |  5 +++++
 2 files changed, 27 insertions(+)

diff --git a/src/ui/selection_plugin.cpp b/src/ui/selection_plugin.cpp
index 0e5df37..a1aeaf5 100644
--- a/src/ui/selection_plugin.cpp
+++ b/src/ui/selection_plugin.cpp
@@ -203,6 +203,28 @@ bool Selection_Menu::key_down(int key, int modifiers) {
     return false;
 }
 
+bool Selection_Menu::mouse_down(int button, int modifier) {
+    double current_press_time = glfwGetTime();
+    bool left_mouse = glfwGetMouseButton(viewer->window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS;
+    bool right_mouse = glfwGetMouseButton(viewer->window, GLFW_MOUSE_BUTTON_2) == GLFW_PRESS;
+    if (left_mouse || right_mouse) {
+        if (!is_first_button_down) {
+            is_first_button_down = left_mouse || right_mouse;
+            mouse_down_time = current_press_time;
+        }
+        else {
+            double delta_time = current_press_time - mouse_down_time;
+            mouse_down_time = 0.0;
+            is_first_button_down = false;
+            if (delta_time < mouse_click_threshold) { // CLICK
+                should_select = true;
+                return true;
+            }
+        }
+    } 
+    return false;
+}
+
 bool Selection_Menu::post_draw() {
     bool ret = FishUIViewerPlugin::post_draw();
 
diff --git a/src/ui/selection_plugin.h b/src/ui/selection_plugin.h
index 9abca9d..5c95211 100644
--- a/src/ui/selection_plugin.h
+++ b/src/ui/selection_plugin.h
@@ -17,6 +17,7 @@ class Selection_Menu : public FishUIViewerPlugin {
     void deinitialize();
 
     bool key_down(int key, int modifiers) override;
+    bool mouse_down(int button, int modifier) override;
     bool post_draw() override;
 
 private:
@@ -30,6 +31,10 @@ class Selection_Menu : public FishUIViewerPlugin {
     Parameters rendering_params;
     SelectionRenderer selection_renderer;
 
+    double mouse_down_time = 0.0;
+    double mouse_click_threshold = 0.2;
+    bool is_first_button_down = false;
+
     glm::vec2 clicked_mouse_position = { 0.f, 0.f };
     bool is_currently_interacting = false;
     int current_interaction_index = -1;