dispatch repaint events and lay yet more groundwork

src/Box.cpp

@@ -6,9 +6,21 @@ bool Box::contains_point(double x, double y) {
     return x >= m_x && m_x + m_width >= x && y >= m_y && m_y + m_height >= y;
 }
 
-bool Box::contains_box(const Box &other) {
-    // FIXME
-    return false;
+bool Box::contains_box(Box &other) const {
+    double ax1 = m_x;
+    double ax2 = m_x + m_width;
+    double ay1 = m_y;
+    double ay2 = m_y + m_height;
+    
+    double bx1 = other.get_x();
+    double bx2 = other.get_x() + other.get_width();
+    double by1 = other.get_y();
+    double by2 = other.get_y() + other.get_height();
+
+    // https://stackoverflow.com/a/306332
+    bool boxes_overlap = (ax1 < bx2 && ax2 > bx1 && ay1 < by2 && ay2 > by1);
+
+    return boxes_overlap;
 }
 
 }

src/Box.hpp

@@ -30,7 +30,7 @@ public:
     void set_height(double height) { m_height = height; }
 
     bool contains_point(double x, double y);
-    bool contains_box(const Box &other);
+    bool contains_box(Box &other) const;
 };
 
 }

src/Button.cpp

@@ -0,0 +1,13 @@
+#include "Button.hpp"
+#include "Window.hpp"
+
+namespace Raven {
+
+void Button::on_paint() {
+    auto painter = get_window()->get_painter();
+    auto ctx = painter.get_cairo();
+
+    
+}
+
+}

src/Button.hpp

@@ -0,0 +1,22 @@
+#include <string>
+#include "Widget.hpp"
+
+#pragma once
+
+namespace Raven {
+
+class Button : public Widget {
+private:
+    std::string m_text;
+public:
+    Button(std::string text)
+        : Widget()
+        , m_text(text) {}
+
+    void set_text(std::string text) { m_text = text; wants_repaint(); }
+    std::string &get_text() { return m_text; }
+
+    void on_paint();
+};
+
+}

src/Events.hpp

@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 #include "Point.hpp"
+#include "Box.hpp"
 
 namespace Raven {
 
@@ -57,11 +58,16 @@ public:
 };
 
 class WidgetRepaintRequestedEvent : public Event {
+private:
+    Box m_repaint_area;
 public:
-    WidgetRepaintRequestedEvent() {}
+    WidgetRepaintRequestedEvent(Box repaint_area)
+        : m_repaint_area(repaint_area) {}
 
     EventType get_type() { return EventType::WidgetRepaintRequested; }
     const char *get_name() { return "WidgetRepaintRequested"; }
+
+    Box &get_repaint_area() { return m_repaint_area; }
 };
 
 }

src/Forward.hpp

@@ -0,0 +1,11 @@
+namespace Raven {
+    class Box;
+    class Button;
+    class Events;
+    class Painter;
+    class Point;
+    class Widget;
+    class Window;
+
+    enum class EventType;
+}

src/Painter.cpp

@@ -0,0 +1,22 @@
+#include "Painter.hpp"
+
+namespace Raven {
+
+void Painter::rounded_rectangle(Box &geometry, double border_radius) {
+    double aspect = 1.0;
+    double radius = border_radius / aspect;
+    double degrees = M_PI / 180.0;
+    double x = geometry.get_x();
+    double y = geometry.get_y();
+    double w = geometry.get_width();
+    double h = geometry.get_height();
+
+    m_cairo->begin_new_sub_path();
+    m_cairo->arc(x + w - radius, y + radius, radius, -90 * degrees, 0 * degrees);
+    m_cairo->arc(x + w - radius, y + h - radius, radius, 0 * degrees, 90 * degrees);
+    m_cairo->arc(x + radius, y + h - radius, radius, 90 * degrees, 180 * degrees);
+    m_cairo->arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
+    m_cairo->close_path();
+}
+
+}

src/Painter.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Box.hpp"
 #include <cairomm/cairomm.h>
 
 namespace Raven {
@@ -12,6 +13,8 @@ public:
 
     Cairo::RefPtr<Cairo::Context> get_cairo() { return m_cairo; }
     void set_cairo(Cairo::RefPtr<Cairo::Context> cairo) { m_cairo = cairo; }
+
+    void rounded_rectangle(Box &geometry, double border_radius);
 };
 
 }

src/Widget.cpp

@@ -1,9 +1,78 @@
 #include <iostream>
+#include <algorithm>
 #include "Widget.hpp"
 #include "Events.hpp"
+#include "Window.hpp"
 
 namespace Raven {
 
+void Widget::wants_repaint() {
+    if (!m_window)
+        return;
+
+    m_window->dispatch_repaint_on_box(m_current_geometry);
+}
+
+bool Widget::add_child(Widget *child) {
+    if (child->get_parent()) {
+        return false;
+    }
+    m_children.push_back(child);
+    child->set_parent(this);
+    // children inherit the window from the parent
+    // TODO?: what happens when the parent changes its window?
+    child->set_window(m_window);
+    return true;
+}
+
+void Widget::remove_child(Widget *child) {
+    m_children.erase(std::remove(m_children.begin(), m_children.end(), child), m_children.end());
+}
+
+void Widget::handle_repaint_requested(WidgetRepaintRequestedEvent &event) {
+    std::cout << "-------\n";
+
+    std::cout << "-- repaint_area: "
+        << event.get_repaint_area().get_x()
+        << ", "
+        << event.get_repaint_area().get_y()
+        << ", "
+        << event.get_repaint_area().get_width()
+        << ", "
+        << event.get_repaint_area().get_height()
+        << " --\n";
+
+    std::cout << "-- m_current_geometry: "
+        << m_current_geometry.get_x()
+        << ", "
+        << m_current_geometry.get_y()
+        << ", "
+        << m_current_geometry.get_width()
+        << ", "
+        << m_current_geometry.get_height()
+        << " --\n";
+
+    std::cout << "-------\n";
+
+    // widgets contain all of thier children inside their geometry
+    // we will check if the event's repaint area (the area that needs to be repainted :))
+    // overlaps with our geometry. If it does, we will proceed with the repaint process
+    if (!event.get_repaint_area().contains_box(m_current_geometry)) {
+        return;
+    }
+
+    std::cout << "--- PASSED\n";
+
+    on_paint(); // we're going to call this widget's paint function
+
+    // tell all children about this event
+    // the repaint area matching the geometry is checked at the start of
+    // this function, which means they'll repaint as well if it is needed
+    for (auto& child : m_children) {
+        child->dispatch_event(event);
+    }
+}
+
 void Widget::dispatch_event(Event &event) {
     process_event(event);
 }
@@ -19,7 +88,7 @@ void Widget::process_event(Event &event) {
             break;
         }
         case EventType::WidgetRepaintRequested: {
-            on_paint();
+            handle_repaint_requested(reinterpret_cast<WidgetRepaintRequestedEvent&>(event));
             break;
         }
         case EventType::NoneEvent: {

src/Widget.hpp

@@ -1,29 +1,47 @@
 #pragma once
 
+#include <vector>
 #include "Box.hpp"
 #include "Events.hpp"
+#include "Forward.hpp"
 
 namespace Raven {
 
 class Widget {
 private:
     Box m_current_geometry {};
+    std::vector<Widget*> m_children;
+    Widget *m_parent { nullptr };
+    Window *m_window { nullptr };
 public:
-    Widget() {
+    Widget() {}
 
-    }
+    Box &get_current_geometry() { return m_current_geometry; }
+    void set_current_geometry(Box current_geometry) { m_current_geometry = current_geometry; wants_repaint(); }
+
+    std::vector<Widget*> &get_children() { return m_children; }
+    bool add_child(Widget *child);
+    void remove_child(Widget *child);
+
+    Widget *get_parent() { return m_parent; }
+    void set_parent(Widget *parent) { m_parent = parent; }
+
+    Window *get_window() { return m_window; }
+    void set_window(Window *window) { m_window = window; }
 
-    const Box &get_current_geometry() const { return m_current_geometry; }
 
     void dispatch_event(Event &event);
+    void wants_repaint();
+    Widget *walk_until_top_level();
 
-    virtual void on_mouse_button(MouseButtonEvent &event) = 0;
-    virtual void on_mouse_move(MouseMoveEvent &event) = 0;
-    virtual void on_paint() = 0;
+    virtual void on_mouse_button(MouseButtonEvent &event) {};
+    virtual void on_mouse_move(MouseMoveEvent &event) {};
+    virtual void on_paint() {};
 
     virtual ~Widget() = default;
 private:
     void process_event(Event &event);
+    void handle_repaint_requested(WidgetRepaintRequestedEvent &event);
 };
 
 }

src/Window.cpp

@@ -1,6 +1,5 @@
-#include <X11/X.h>
 #include <iostream>
-#include "Window.hpp"
+#include <X11/X.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <cairomm/cairomm.h>
@@ -8,8 +7,16 @@
 #include <cairomm/surface.h>
 #include <cairomm/xlib_surface.h>
 
+#include "Window.hpp"
+#include "Events.hpp"
+
 namespace Raven {
 
+void Window::set_main_widget(Widget *main_widget) {
+    m_main_widget = main_widget;
+    m_main_widget->set_window(this);
+}
+
 bool Window::spawn_window() {
     Display *dsp = XOpenDisplay(NULL);
     if (dsp == NULL) {
@@ -38,6 +45,19 @@ bool Window::spawn_window() {
     return true;
 }
 
+void Window::dispatch_repaint_on_box(Box box) {
+    if (!m_main_widget)
+        return;
+
+    auto event = WidgetRepaintRequestedEvent(std::move(box));
+
+    m_main_widget->dispatch_event(event);
+}
+
+void Window::dispatch_full_repaint() {
+    dispatch_repaint_on_box(m_current_geometry);
+} 
+
 void Window::run(bool block) {
     XEvent e;
 
@@ -48,16 +68,15 @@ void Window::run(bool block) {
             break;
 
         switch (e.type) {
-            case MapNotify: {
-                std::cout << "MapNotify\n";
+            case MapNotify:
+            case Expose:
+                std::cout << "gotta repaint!\n";
+                dispatch_full_repaint();
                 break;
-            }
-            case Expose: {
-                std::cout << "we'd probably repaint the window right now\n";
+            default:
                 break;
         }
     }
-    }
 }
 
 }

src/Window.hpp

@@ -8,7 +8,8 @@ namespace Raven {
 
 class Window {
 private:
-    Widget *m_active_widget { nullptr };
+    Widget *m_hovered_widget { nullptr };
+    Widget *m_main_widget { nullptr };
     Box m_current_geometry { 0, 0, 800, 600 };
     Painter m_painter {};
 
@@ -18,8 +19,15 @@ public:
 
     Painter &get_painter() { return m_painter; }
 
-    Widget *get_active_widget() { return m_active_widget; }
-    void set_active_widget(Widget *active_widget) { m_active_widget = active_widget; }
+    Widget *get_hovered_widget() { return m_hovered_widget; }
+    void set_hovered_widget(Widget *hovered_widget) { m_hovered_widget = hovered_widget; }
+
+    Widget *get_main_widget() { return m_main_widget; }
+    void set_main_widget(Widget *main_widget);
+
+
+    void dispatch_repaint_on_box(Box box);
+    void dispatch_full_repaint();
 
     Box &get_current_geometry() { return m_current_geometry; }
 

src/main.cpp

@@ -1,11 +1,17 @@
 #include <iostream>
 #include "Window.hpp"
+#include "Widget.hpp"
+#include "Box.hpp"
 
 int main() {
     Raven::Window window {};
+    Raven::Widget main_widget {};
 
     window.spawn_window();
-    window.run(true);
 
+    main_widget.set_current_geometry(Raven::Box(10, 10, 100, 30));
+    window.set_main_widget(&main_widget);
+
+    window.run(true);
     return 0;
 }