From a9e48a509a8ec312321e0ccb0cb3974c16546dc9 Mon Sep 17 00:00:00 2001
From: Brad Grantham <grantham@plunk.org>
Date: Mon, 15 Oct 2018 21:09:51 -0700
Subject: [PATCH] initial breakout of UI widget classes

---
 interface.cpp | 261 +-----------------------------------------------
 ui_widgets.h  | 267 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 269 insertions(+), 259 deletions(-)
 create mode 100644 ui_widgets.h

diff --git a/interface.cpp b/interface.cpp
index 57461af..96a2c31 100644
--- a/interface.cpp
+++ b/interface.cpp
@@ -28,6 +28,8 @@
 #define GLFW_INCLUDE_GLCOREARB
 #include <GLFW/glfw3.h>
 
+#include "ui_widgets.h"
+
 #include "glwidget.h"
 
 #include "interface.h"
@@ -601,265 +603,6 @@ void set_shader(float to_screen[9], DisplayMode display_mode, bool mixed_mode, i
     }
 }
 
-typedef pair<float, float> width_height;
-
-struct widget
-{
-    virtual width_height get_min_dimensions() const = 0;
-    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h) {};
-    virtual bool click(double now, float x, float y) { return false; };
-    virtual void hover(double now, float x, float y) {};
-    virtual void drag(double now, float x, float y) {};
-    virtual void release(double now, float x, float y) {};
-    virtual bool drop(double now, float x, float y, int count, const char** paths) { return false; };
-};
-
-struct switcher
-{
-    float w, h;
-    int which;
-    vector<widget*> children;
-    switcher(vector<widget*> children_) :
-        w(0),
-        h(0),
-        which(0),
-        children(children_)
-    {
-        for(auto it : children) {
-            float cw, ch;
-            tie(cw, ch) = it->get_min_dimensions();
-            w = max(w, cw);
-            h = max(h, ch);
-        }
-    }
-    virtual width_height get_min_dimensions() const 
-    {
-        return {w, h};
-    }
-    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h)
-    {
-        children[which]->draw(now, to_screen, x, y, w, h);
-    }
-    virtual bool click(double now, float x, float y)
-    {
-        return children[which]->click(now, x, y);
-    }
-    virtual void hover(double now, float x, float y)
-    {
-        children[which]->hover(now, x, y);
-    }
-    virtual void drag(double now, float x, float y)
-    {
-        children[which]->drag(now, x, y);
-    }
-    virtual void release(double now, float x, float y)
-    {
-        children[which]->release(now, x, y);
-    }
-    virtual bool drop(double now, float x, float y, int count, const char** paths)
-    {
-        return children[which]->drop(now, x, y, count, paths);
-    }
-};
-
-struct spacer : public widget
-{
-    float w, h;
-    spacer(float w_, float h_) :
-        w(w_),
-        h(h_)
-    {}
-    virtual width_height get_min_dimensions() const 
-    {
-        return {w, h};
-    }
-};
-
-struct placed_widget
-{
-    widget *widg;
-    float x, y, w, h;
-};
-
-struct padding : public widget
-{
-    widget* child;
-    float w, h;
-    float left_pad, right_pad, top_pad, bottom_pad;
-    float cw, ch;
-
-    padding(float left_pad_, float right_pad_, float top_pad_, float bottom_pad_, widget* child_) :
-        child(child_),
-        left_pad(left_pad_),
-        right_pad(right_pad_),
-        top_pad(top_pad_),
-        bottom_pad(bottom_pad_)
-    {
-        tie(cw, ch) = child->get_min_dimensions();
-        w = cw + left_pad_ + right_pad_;
-        h = ch + top_pad_ + bottom_pad_;
-    }
-
-    virtual width_height get_min_dimensions() const
-    {
-        return {w, h};
-    }
-    virtual void draw(double now, float to_screen[9], float x, float y, float w_, float h_)
-    {
-        child->draw(now, to_screen, x + left_pad, y + top_pad, w_ - left_pad - right_pad, h_ - top_pad - bottom_pad);
-    }
-    virtual bool drop(double now, float x, float y, int count, const char **paths)
-    {
-        return child->drop(now, x + left_pad, y + top_pad, count, paths);
-    }
-    virtual bool click(double now, float x, float y)
-    {
-        return child->click(now, x + left_pad, y + top_pad);
-    }
-    virtual void hover(double now, float x, float y)
-    {
-        child->hover(now, x + left_pad, y + top_pad);
-    }
-    virtual void drag(double now, float x, float y)
-    {
-        child->drag(now, x + left_pad, y + top_pad);
-    }
-    virtual void release(double now, float x, float y)
-    {
-        child->release(now, x + left_pad, y + top_pad);
-    }
-};
-
-struct centering : public widget
-{
-    float w, h;
-    float cw, ch;
-    widget* child;
-
-    centering(widget* child_) : child(child_)
-    {
-        tie(cw, ch) = child->get_min_dimensions();
-    }
-
-    virtual width_height get_min_dimensions() const
-    {
-        return {cw, ch};
-    }
-    virtual void draw(double now, float to_screen[9], float x, float y, float w_, float h_)
-    {
-        w = w_;
-        h = h_;
-        child->draw(now, to_screen, x + (w - cw) / 2, y + (h - ch) / 2, cw, ch);
-    }
-    virtual bool drop(double now, float x, float y, int count, const char **paths)
-    {
-        return child->drop(now, x - (w - cw) / 2, y - (h - ch) / 2, count, paths);
-    }
-    virtual bool click(double now, float x, float y)
-    {
-        return child->click(now, x - (w - cw) / 2, y - (h - ch) / 2); // XXX should limit to cw,ch too
-    }
-    virtual void hover(double now, float x, float y)
-    {
-        child->hover(now, x - (w - cw) / 2, y - (h - ch) / 2);
-    }
-    virtual void drag(double now, float x, float y)
-    {
-        child->drag(now, x - (w - cw) / 2, y - (h - ch) / 2);
-    }
-    virtual void release(double now, float x, float y)
-    {
-        child->release(now, x - (w - cw) / 2, y - (h - ch) / 2);
-    }
-};
-
-struct widgetbox : public widget
-{
-    enum Direction {VERTICAL, HORIZONTAL} dir;
-    float w, h;
-    vector<placed_widget> children;
-    placed_widget focus;
-
-    widgetbox(Direction dir_, vector<widget*> children_) :
-        dir(dir_),
-        w(0),
-        h(0),
-        focus({nullptr, 0, 0, 0, 0})
-    {
-        for(auto it : children_) {
-            widget *child = it;
-            float cw, ch;
-            tie(cw, ch) = child->get_min_dimensions();
-            if(dir == HORIZONTAL) {
-                w += cw;
-                h = std::max(h, ch);
-            } else {
-                w = std::max(w, cw);
-                h += ch;
-            }
-        }
-        float x = 0;
-        float y = 0;
-        for(auto it : children_) {
-            widget *child = it;
-            float cw, ch;
-            tie(cw, ch) = child->get_min_dimensions();
-            if(dir == HORIZONTAL) {
-                children.push_back({child, x, y, cw, h});
-                x += cw;
-            } else {
-                children.push_back({child, x, y, w, ch});
-                y += ch;
-            }
-        }
-    }
-    virtual width_height get_min_dimensions() const
-    {
-        return {w, h};
-    }
-    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h)
-    {
-        for(auto child : children) {
-            child.widg->draw(now, to_screen, x + child.x, y + child.y, child.w, child.h);
-        }
-    }
-    virtual bool drop(double now, float x, float y, int count, const char **paths)
-    {
-        for(auto child : children) {
-            if(child.widg->drop(now, x - child.x, y - child.y, count, paths)) {
-                return true;
-            }
-        }
-        return false;
-    }
-    virtual bool click(double now, float x, float y)
-    {
-        for(auto child : children) {
-            if(child.widg->click(now, x - child.x, y - child.y)) {
-                focus = child;
-                return true;
-            }
-        }
-        return false;
-    }
-    virtual void hover(double now, float x, float y)
-    {
-        for(auto child : children) {
-            if(x >= child.x && x < child.x + child.w && y >= child.y && y < child.y + child.h)
-                child.widg->hover(now, x - child.x, y - child.y);
-        }
-    }
-    virtual void drag(double now, float x, float y)
-    {
-        focus.widg->click(now, x - focus.x, y - focus.y);
-    }
-    virtual void release(double now, float x, float y)
-    {
-        focus.widg->release(now, x - focus.x, y - focus.y);
-        focus = {nullptr, 0, 0};
-    }
-};
-
 void set(float v[4], float x, float y, float z, float w)
 {
     v[0] = x;
diff --git a/ui_widgets.h b/ui_widgets.h
new file mode 100644
index 0000000..74c96b5
--- /dev/null
+++ b/ui_widgets.h
@@ -0,0 +1,267 @@
+#ifndef _UI_WIDGETS_H_
+#define _UI_WIDGETS_H_
+
+#include <utility>
+#include <vector>
+#include <tuple>
+
+typedef std::pair<float, float> width_height;
+
+struct widget
+{
+    virtual width_height get_min_dimensions() const = 0;
+    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h) {};
+    virtual bool click(double now, float x, float y) { return false; };
+    virtual void hover(double now, float x, float y) {};
+    virtual void drag(double now, float x, float y) {};
+    virtual void release(double now, float x, float y) {};
+    virtual bool drop(double now, float x, float y, int count, const char** paths) { return false; };
+};
+
+struct switcher
+{
+    float w, h;
+    int which;
+    std::vector<widget*> children;
+    switcher(std::vector<widget*> children_) :
+        w(0),
+        h(0),
+        which(0),
+        children(children_)
+    {
+        for(auto it : children) {
+            float cw, ch;
+            std::tie(cw, ch) = it->get_min_dimensions();
+            w = std::max(w, cw);
+            h = std::max(h, ch);
+        }
+    }
+    virtual width_height get_min_dimensions() const 
+    {
+        return {w, h};
+    }
+    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h)
+    {
+        children[which]->draw(now, to_screen, x, y, w, h);
+    }
+    virtual bool click(double now, float x, float y)
+    {
+        return children[which]->click(now, x, y);
+    }
+    virtual void hover(double now, float x, float y)
+    {
+        children[which]->hover(now, x, y);
+    }
+    virtual void drag(double now, float x, float y)
+    {
+        children[which]->drag(now, x, y);
+    }
+    virtual void release(double now, float x, float y)
+    {
+        children[which]->release(now, x, y);
+    }
+    virtual bool drop(double now, float x, float y, int count, const char** paths)
+    {
+        return children[which]->drop(now, x, y, count, paths);
+    }
+};
+
+struct spacer : public widget
+{
+    float w, h;
+    spacer(float w_, float h_) :
+        w(w_),
+        h(h_)
+    {}
+    virtual width_height get_min_dimensions() const 
+    {
+        return {w, h};
+    }
+};
+
+struct placed_widget
+{
+    widget *widg;
+    float x, y, w, h;
+};
+
+struct padding : public widget
+{
+    widget* child;
+    float w, h;
+    float left_pad, right_pad, top_pad, bottom_pad;
+    float cw, ch;
+
+    padding(float left_pad_, float right_pad_, float top_pad_, float bottom_pad_, widget* child_) :
+        child(child_),
+        left_pad(left_pad_),
+        right_pad(right_pad_),
+        top_pad(top_pad_),
+        bottom_pad(bottom_pad_)
+    {
+        std::tie(cw, ch) = child->get_min_dimensions();
+        w = cw + left_pad_ + right_pad_;
+        h = ch + top_pad_ + bottom_pad_;
+    }
+
+    virtual width_height get_min_dimensions() const
+    {
+        return {w, h};
+    }
+    virtual void draw(double now, float to_screen[9], float x, float y, float w_, float h_)
+    {
+        child->draw(now, to_screen, x + left_pad, y + top_pad, w_ - left_pad - right_pad, h_ - top_pad - bottom_pad);
+    }
+    virtual bool drop(double now, float x, float y, int count, const char **paths)
+    {
+        return child->drop(now, x + left_pad, y + top_pad, count, paths);
+    }
+    virtual bool click(double now, float x, float y)
+    {
+        return child->click(now, x + left_pad, y + top_pad);
+    }
+    virtual void hover(double now, float x, float y)
+    {
+        child->hover(now, x + left_pad, y + top_pad);
+    }
+    virtual void drag(double now, float x, float y)
+    {
+        child->drag(now, x + left_pad, y + top_pad);
+    }
+    virtual void release(double now, float x, float y)
+    {
+        child->release(now, x + left_pad, y + top_pad);
+    }
+};
+
+struct centering : public widget
+{
+    float w, h;
+    float cw, ch;
+    widget* child;
+
+    centering(widget* child_) : child(child_)
+    {
+        std::tie(cw, ch) = child->get_min_dimensions();
+    }
+
+    virtual width_height get_min_dimensions() const
+    {
+        return {cw, ch};
+    }
+    virtual void draw(double now, float to_screen[9], float x, float y, float w_, float h_)
+    {
+        w = w_;
+        h = h_;
+        child->draw(now, to_screen, x + (w - cw) / 2, y + (h - ch) / 2, cw, ch);
+    }
+    virtual bool drop(double now, float x, float y, int count, const char **paths)
+    {
+        return child->drop(now, x - (w - cw) / 2, y - (h - ch) / 2, count, paths);
+    }
+    virtual bool click(double now, float x, float y)
+    {
+        return child->click(now, x - (w - cw) / 2, y - (h - ch) / 2); // XXX should limit to cw,ch too
+    }
+    virtual void hover(double now, float x, float y)
+    {
+        child->hover(now, x - (w - cw) / 2, y - (h - ch) / 2);
+    }
+    virtual void drag(double now, float x, float y)
+    {
+        child->drag(now, x - (w - cw) / 2, y - (h - ch) / 2);
+    }
+    virtual void release(double now, float x, float y)
+    {
+        child->release(now, x - (w - cw) / 2, y - (h - ch) / 2);
+    }
+};
+
+struct widgetbox : public widget
+{
+    enum Direction {VERTICAL, HORIZONTAL} dir;
+    float w, h;
+    std::vector<placed_widget> children;
+    placed_widget focus;
+
+    widgetbox(Direction dir_, std::vector<widget*> children_) :
+        dir(dir_),
+        w(0),
+        h(0),
+        focus({nullptr, 0, 0, 0, 0})
+    {
+        for(auto it : children_) {
+            widget *child = it;
+            float cw, ch;
+            std::tie(cw, ch) = child->get_min_dimensions();
+            if(dir == HORIZONTAL) {
+                w += cw;
+                h = std::max(h, ch);
+            } else {
+                w = std::max(w, cw);
+                h += ch;
+            }
+        }
+        float x = 0;
+        float y = 0;
+        for(auto it : children_) {
+            widget *child = it;
+            float cw, ch;
+            std::tie(cw, ch) = child->get_min_dimensions();
+            if(dir == HORIZONTAL) {
+                children.push_back({child, x, y, cw, h});
+                x += cw;
+            } else {
+                children.push_back({child, x, y, w, ch});
+                y += ch;
+            }
+        }
+    }
+    virtual width_height get_min_dimensions() const
+    {
+        return {w, h};
+    }
+    virtual void draw(double now, float to_screen[9], float x, float y, float w, float h)
+    {
+        for(auto child : children) {
+            child.widg->draw(now, to_screen, x + child.x, y + child.y, child.w, child.h);
+        }
+    }
+    virtual bool drop(double now, float x, float y, int count, const char **paths)
+    {
+        for(auto child : children) {
+            if(child.widg->drop(now, x - child.x, y - child.y, count, paths)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    virtual bool click(double now, float x, float y)
+    {
+        for(auto child : children) {
+            if(child.widg->click(now, x - child.x, y - child.y)) {
+                focus = child;
+                return true;
+            }
+        }
+        return false;
+    }
+    virtual void hover(double now, float x, float y)
+    {
+        for(auto child : children) {
+            if(x >= child.x && x < child.x + child.w && y >= child.y && y < child.y + child.h)
+                child.widg->hover(now, x - child.x, y - child.y);
+        }
+    }
+    virtual void drag(double now, float x, float y)
+    {
+        focus.widg->click(now, x - focus.x, y - focus.y);
+    }
+    virtual void release(double now, float x, float y)
+    {
+        focus.widg->release(now, x - focus.x, y - focus.y);
+        focus = {nullptr, 0, 0};
+    }
+};
+
+#endif /* _UI_WIDGETS_H_ */