make window respond to events and lay more groundwork

meson.build

@@ -1,16 +1,15 @@
-project('blit', 'cpp')
-
+project('raven', 'cpp')
 
 cairomm_dep = dependency('cairomm-1.0')
 pangocairo_dep = dependency('pangocairo')
 xlib_dep = dependency('x11')
 
 executable(
-    'blit_app',
+    'ravenapp',
     './src/Box.cpp',
-    './src/Point.cpp',
     './src/Events.cpp',
     './src/Widget.cpp',
+    './src/Painter.cpp',
     './src/Window.cpp',
     './src/main.cpp',
     dependencies : [cairomm_dep, xlib_dep, pangocairo_dep]

src/Events.hpp

@@ -1,13 +1,16 @@
+#pragma once
+
 #include <stdint.h>
 #include "Point.hpp"
 
 namespace Raven {
 
 enum class EventType {
-    None,
+    NoneEvent,
 
     MouseButton,
-    MouseMove
+    MouseMove,
+    WidgetRepaintRequested
 };
 
 class Event {
@@ -18,8 +21,10 @@ public:
 
     void accept() { m_accepted = true; }
     bool is_accepted() { return m_accepted; }
-    virtual EventType get_event_type() { return EventType::None; }
-    virtual const char *get_event_name() { return "None"; }
+    virtual EventType get_type() { return EventType::NoneEvent; }
+    virtual const char *get_name() { return "NoneEvent"; }
+
+    virtual ~Event() = default;
 };
 
 class MouseButtonEvent : public Event {
@@ -31,8 +36,8 @@ public:
         : m_was_left_button_pressed(was_left_button_pressed)
         , m_was_right_button_pressed(was_right_button_pressed) {}
 
-    EventType get_event_type() { return EventType::MouseButton; }
-    const char *get_event_name() { return "MouseButton"; }
+    EventType get_type() { return EventType::MouseButton; }
+    const char *get_name() { return "MouseButton"; }
 
     bool get_was_left_button_pressed() { return m_was_left_button_pressed; }
     bool get_was_right_button_pressed() { return m_was_right_button_pressed; }
@@ -45,10 +50,18 @@ public:
     MouseMoveEvent(Point point)
         : m_point(point) {}
 
-    EventType get_event_type() { return EventType::MouseMove; }
-    const char *get_event_name() { return "MouseMove"; }
+    EventType get_type() { return EventType::MouseMove; }
+    const char *get_name() { return "MouseMove"; }
 
     Point &get_point() { return m_point; }
 };
 
+class WidgetRepaintRequestedEvent : public Event {
+public:
+    WidgetRepaintRequestedEvent() {}
+
+    EventType get_type() { return EventType::WidgetRepaintRequested; }
+    const char *get_name() { return "WidgetRepaintRequested"; }
+};
+
 }

src/Painter.hpp

@@ -1,9 +1,17 @@
+#pragma once
+
+#include <cairomm/cairomm.h>
+
 namespace Raven {
 
 class Painter {
-    Painter() {
+private:
+    Cairo::RefPtr<Cairo::Context> m_cairo;
+public:
+    Painter() {}
 
-    }
+    Cairo::RefPtr<Cairo::Context> get_cairo() { return m_cairo; }
+    void set_cairo(Cairo::RefPtr<Cairo::Context> cairo) { m_cairo = cairo; }
 };
 
 }

src/Point.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <stdint.h>
 
 namespace Raven {

src/Widget.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+#include "Widget.hpp"
+#include "Events.hpp"
+
+namespace Raven {
+
+void Widget::dispatch_event(Event &event) {
+    process_event(event);
+}
+
+void Widget::process_event(Event &event) {
+    switch (event.get_type()) {
+        case EventType::MouseMove: {
+            on_mouse_move(reinterpret_cast<MouseMoveEvent&>(event));
+            break;
+        }
+        case EventType::MouseButton: {
+            on_mouse_button(reinterpret_cast<MouseButtonEvent&>(event));
+            break;
+        }
+        case EventType::WidgetRepaintRequested: {
+            on_paint();
+            break;
+        }
+        case EventType::NoneEvent: {
+            break;
+        }
+    }
+}
+
+}

src/Widget.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "Box.hpp"
+#include "Events.hpp"
 
 namespace Raven {
 
@@ -13,6 +14,16 @@ public:
     }
 
     const Box &get_current_geometry() const { return m_current_geometry; }
+
+    void dispatch_event(Event &event);
+
+    virtual void on_mouse_button(MouseButtonEvent &event) = 0;
+    virtual void on_mouse_move(MouseMoveEvent &event) = 0;
+    virtual void on_paint() = 0;
+
+    virtual ~Widget() = default;
+private:
+    void process_event(Event &event);
 };
 
 }

src/Window.cpp

@@ -1,37 +1,63 @@
+#include <X11/X.h>
 #include <iostream>
 #include "Window.hpp"
 #include <X11/Xlib.h>
-#include <cairomm-1.0/cairomm/cairomm.h>
-#include <cairomm-1.0/cairomm/context.h>
-#include <cairomm-1.0/cairomm/surface.h>
-#include <cairomm-1.0/cairomm/xlib_surface.h>
+#include <X11/Xutil.h>
+#include <cairomm/cairomm.h>
+#include <cairomm/context.h>
+#include <cairomm/surface.h>
+#include <cairomm/xlib_surface.h>
 
 namespace Raven {
 
 bool Window::spawn_window() {
-    Display *dsp;
-    Drawable da;
-    int screen;
-
-    if ((dsp = XOpenDisplay(NULL)) == NULL) {
+    Display *dsp = XOpenDisplay(NULL);
+    if (dsp == NULL) {
         std::cout << "error: XOpenDisplay(NULL)" << "\n";
         return false;
     }
+    m_x_display = dsp;
 
-    screen = DefaultScreen(dsp);
-    da = XCreateSimpleWindow(dsp, DefaultRootWindow(dsp), 0, 0, get_current_geometry().get_width(), get_current_geometry().get_height(), 0, 0, 0);
-    XSelectInput(dsp, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask | PointerMotionMask);
+    int screen = DefaultScreen(dsp);
+    Drawable da = XCreateSimpleWindow(dsp, DefaultRootWindow(dsp), 0, 0, m_current_geometry.get_width(), m_current_geometry.get_height(), 0, 0, 0);
+
+    XSelectInput(dsp, da, ButtonPressMask | ButtonReleaseMask | KeyPressMask | PointerMotionMask | StructureNotifyMask | ExposureMask);
     XMapWindow(dsp, da);
-    auto x_surface = Cairo::XlibSurface::create(
+
+    auto cairo_xlib_surface = Cairo::XlibSurface::create(
         dsp,
         da,
         DefaultVisual(dsp, screen),
         get_current_geometry().get_width(),
         get_current_geometry().get_height()
     );
-    Cairo::Context::create(x_surface);
+    auto cairo_context = Cairo::Context::create(cairo_xlib_surface);
+
+    m_painter.set_cairo(cairo_context);
 
     return true;
 }
 
+void Window::run(bool block) {
+    XEvent e;
+
+    for (;;) {
+        if (block || XPending(m_x_display))
+            XNextEvent(m_x_display, &e);
+        else
+            break;
+
+        switch (e.type) {
+            case MapNotify: {
+                std::cout << "MapNotify\n";
+                break;
+            }
+            case Expose: {
+                std::cout << "we'd probably repaint the window right now\n";
+                break;
+            }
+        }
+    }
+}
+
 }

src/Window.hpp

@@ -1,4 +1,8 @@
+#pragma once
+
 #include "Widget.hpp"
+#include "Painter.hpp"
+#include <X11/Xlib.h>
 
 namespace Raven {
 
@@ -6,17 +10,21 @@ class Window {
 private:
     Widget *m_active_widget { nullptr };
     Box m_current_geometry { 0, 0, 800, 600 };
-public:
-    Window() {
+    Painter m_painter {};
 
-    }
+    Display *m_x_display { nullptr };
+public:
+    Window() {}
+
+    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; }
+
     Box &get_current_geometry() { return m_current_geometry; }
 
     bool spawn_window();
-    void window_event_loop();
+    void run(bool block);
 };
 
 }

src/main.cpp

@@ -2,10 +2,10 @@
 #include "Window.hpp"
 
 int main() {
-    Raven::Window window{};
+    Raven::Window window {};
 
     window.spawn_window();    
-    for(;;){}
+    window.run(true);
 
     return 0;
 }