scrollview

8 files changed, 201 insertions, 27 deletions

diff --git a/src/common.c b/src/common.c
index 74dcf44..249a0d3 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1,6 +1,27 @@
 #include "../include/common.h"
+#include <mgl/window/window.h>
+
+static inline float max_float(float a, float b) {
+    return a >= b ? a : b;
+}
+
+static inline float min_float(float a, float b) {
+    return a <= b ? a : b;
+}
 
 bool mgui_rectangle_contains(mgl_vec2f rectangle_pos, mgl_vec2f rectangle_size, mgl_vec2f point) {
     return point.x >= rectangle_pos.x && point.x <= rectangle_pos.x + rectangle_size.x
         && point.y >= rectangle_pos.y && point.y <= rectangle_pos.y + rectangle_size.y;
 }
+
+bool mgui_rectangle_intersects_with_scissor(mgl_vec2i rectangle_pos, mgl_vec2i rectangle_size, mgl_window *window) {
+    mgl_scissor scissor;
+    mgl_window_get_scissor(window, &scissor);
+
+    const int left_x    = max_float(rectangle_pos.x, scissor.position.x);
+    const int right_x   = min_float(rectangle_pos.x + rectangle_size.x, scissor.position.x + scissor.size.x);
+    const int top_y     = max_float(rectangle_pos.y, scissor.position.y);
+    const int bottom_y  = min_float(rectangle_pos.y + rectangle_size.y, scissor.position.y + scissor.size.y);
+
+    return left_x <= right_x && top_y <= bottom_y;
+}
diff --git a/src/mgui/button.c b/src/mgui/button.c
index 08cf91c..4abe8a0 100644
--- a/src/mgui/button.c
+++ b/src/mgui/button.c
@@ -61,8 +61,11 @@ void mgui_button_on_event(mgui_button *self, mgl_window *window, mgl_event *even
 }
 
 mgl_vec2i mgui_button_draw(mgui_button *self, mgl_window *window) {
-    (void)window;
-    mgl_rectangle_draw(mgl_get_context(), &self->background);
-    mgl_text_draw(mgl_get_context(), &self->text);
-    return (mgl_vec2i){ self->background.size.x, self->background.size.y };
+    const mgl_vec2i position = (mgl_vec2i){ self->background.position.x, self->background.position.y };
+    const mgl_vec2i size = (mgl_vec2i){ self->background.size.x, self->background.size.y };
+    if(mgui_rectangle_intersects_with_scissor(position, size, window)) {
+        mgl_rectangle_draw(mgl_get_context(), &self->background);
+        mgl_text_draw(mgl_get_context(), &self->text);
+    }
+    return size;
 }
diff --git a/src/mgui/image.c b/src/mgui/image.c
index ad8a7d2..a3b163e 100644
--- a/src/mgui/image.c
+++ b/src/mgui/image.c
@@ -45,10 +45,12 @@ void mgui_image_on_event(mgui_image *self, mgl_window *window, mgl_event *event)
 }
 
 mgl_vec2i mgui_image_draw(mgui_image *self, mgl_window *window) {
-    (void)window;
-    mgl_sprite_draw(mgl_get_context(), &self->sprite);
-    if(self->sprite.texture)
-        return (mgl_vec2i){ self->sprite.texture->width, self->sprite.texture->height };
-    else
+    if(self->sprite.texture) {
+        const mgl_vec2i texture_size = (mgl_vec2i){ self->sprite.texture->width, self->sprite.texture->height };
+        if(mgui_rectangle_intersects_with_scissor((mgl_vec2i){ self->sprite.position.x, self->sprite.position.y }, texture_size, window))
+            mgl_sprite_draw(mgl_get_context(), &self->sprite);
+        return texture_size;
+    } else {
         return (mgl_vec2i){ 0, 0 };
+    }
 }
diff --git a/src/mgui/label.c b/src/mgui/label.c
index 5ab1bc0..e67821d 100644
--- a/src/mgui/label.c
+++ b/src/mgui/label.c
@@ -57,8 +57,9 @@ void mgui_label_on_event(mgui_label *self, mgl_window *window, mgl_event *event)
 }
 
 mgl_vec2i mgui_label_draw(mgui_label *self, mgl_window *window) {
-    (void)window;
     const mgl_vec2f text_bounds = mgl_text_get_bounds(&self->text);
-    mgl_text_draw(mgl_get_context(), &self->text);
-    return (mgl_vec2i){ text_bounds.x, text_bounds.y };
+    const mgl_vec2i text_bounds_int = (mgl_vec2i){ text_bounds.x, text_bounds.y };
+    if(mgui_rectangle_intersects_with_scissor(self->position, text_bounds_int, window))
+        mgl_text_draw(mgl_get_context(), &self->text);
+    return text_bounds_int;
 }
diff --git a/src/mgui/list.c b/src/mgui/list.c
index a3a2422..cf39b02 100644
--- a/src/mgui/list.c
+++ b/src/mgui/list.c
@@ -1,8 +1,6 @@
 #include "../../include/mgui/list.h"
 #include "../../include/alloc.h"
 #include <mgl/window/window.h>
-#include <mgl/graphics/rectangle.h>
-#include <mgl/mgl.h>
 #include <assert.h>
 
 /*
@@ -82,23 +80,14 @@ static int max_int(int a, int b) {
     return a >= b ? a : b;
 }
 
+/* TODO: Check if visible in scissor */
+
 mgl_vec2i mgui_list_draw(mgui_list *self, mgl_window *window) {
     mgl_vec2i position = self->position;
     /* TODO: */
     mgl_vec2i size = (mgl_vec2i){ 0, 0 };
 
     /* TODO:
-    mgl_scissor prev_scissor;
-    mgl_window_get_scissor(window, &prev_scissor);
-
-    mgl_scissor new_scissor = {
-        .position = self->position,
-        .size = self->size
-    };
-    mgl_window_set_scissor(window, &new_scissor);
-    */
-
-    /* TODO:
     if(self->background_color.a > 0) {
         mgl_rectangle rect = {
             .position = { self->position.x, self->position.y },
@@ -134,7 +123,5 @@ mgl_vec2i mgui_list_draw(mgui_list *self, mgl_window *window) {
         }
     }
 
-    /* TODO: Remove */
-    /*mgl_window_set_scissor(window, &prev_scissor);*/
     return size;
 }
diff --git a/src/mgui/mgui.c b/src/mgui/mgui.c
new file mode 100644
index 0000000..e2fa0be
--- /dev/null
+++ b/src/mgui/mgui.c
@@ -0,0 +1,20 @@
+#include "../../include/mgui/mgui.h"
+#include "../../include/mgui/widget.h"
+#include <mgl/system/clock.h>
+
+static mgl_clock global_timer;
+
+void mgui_init() {
+    mgl_clock_init(&global_timer);
+}
+
+void mgui_draw(mgui_widget *root_widget, mgl_window *window) {
+    mgui_widget_draw(root_widget, window);
+}
+
+double mgui_get_seconds_since_last_update() {
+    double elapsed_time_sec = mgl_clock_restart(&global_timer);
+    if(elapsed_time_sec > 1.0)
+        elapsed_time_sec = 1.0;
+    return elapsed_time_sec;
+}
diff --git a/src/mgui/scrollview.c b/src/mgui/scrollview.c
new file mode 100644
index 0000000..ae9ad97
--- /dev/null
+++ b/src/mgui/scrollview.c
@@ -0,0 +1,128 @@
+#include "../../include/mgui/scrollview.h"
+#include "../../include/mgui/mgui.h"
+#include "../../include/alloc.h"
+#include <mgl/mgl.h>
+#include <mgl/window/window.h>
+#include <mgl/window/event.h>
+#include <assert.h>
+
+#define SCROLL_ACCEL 20.0f
+#define SCROLL_DEACCEL 10.0f
+
+/* TODO: free child */
+
+mgui_scrollview* mgui_scrollview_create() {
+    mgui_scrollview *scrollview = mgui_alloc(sizeof(mgui_scrollview));
+    mgui_widget_init(&scrollview->widget, MGUI_WIDGET_SCROLLVIEW);
+    scrollview->child = NULL;
+    scrollview->child_size = (mgl_vec2i){ 0, 0 };
+    scrollview->position = (mgl_vec2i){ 0, 0 };
+    scrollview->size = (mgl_vec2i){ 0, 0 };
+    scrollview->scroll = (mgl_vec2i){ 0, 0 };
+    scrollview->mouse_scroll = (mgl_vec2f){ 0.0f, 0.0f };
+    return scrollview;
+}
+
+mgui_widget* mgui_scrollview_to_widget(mgui_scrollview *list) {
+    return &list->widget;
+}
+
+mgui_scrollview* mgui_widget_to_scrollview(mgui_widget *widget) {
+    assert(widget->type == MGUI_WIDGET_SCROLLVIEW);
+    return (mgui_scrollview*)widget;
+}
+
+void mgui_scrollview_set_child(mgui_scrollview *self, mgui_widget *child) {
+    assert(child != mgui_scrollview_to_widget(self));
+    self->child = child;
+}
+
+void mgui_scrollview_set_position(mgui_scrollview *self, mgl_vec2i position) {
+    self->position = position;
+}
+
+void mgui_scrollview_set_size(mgui_scrollview *self, mgl_vec2i size) {
+    self->size = size;
+}
+
+void mgui_scrollview_set_width(mgui_scrollview *self, int width) {
+    /* TODO: Call for child so text can wordwrap? but only if wordwrap is enabled in this scrollview */
+    (void)self;
+    (void)width;
+}
+
+void mgui_scrollview_on_event(mgui_scrollview *self, mgl_window *window, mgl_event *event) {
+    /* TODO: Allow keyboard navigation if scrollview has focus */
+    if(event->type == MGL_EVENT_MOUSE_WHEEL_SCROLLED)
+        self->mouse_scroll.y += (event->mouse_wheel_scroll.delta * SCROLL_ACCEL);
+
+    if(self->child)
+        mgui_widget_on_event(self->child, window, event);
+}
+
+static float max_float(float a, float b) {
+    return a >= b ? a : b;
+}
+
+static int max_int(int a, int b) {
+    return a >= b ? a : b;
+}
+
+static int min_int(int a, int b) {
+    return a <= b ? a : b;
+}
+
+static float abs_float(float value) {
+    return value >= 0.0f ? value : -value;
+}
+
+/* TODO: Check if visible in scissor */
+
+mgl_vec2i mgui_scrollview_draw(mgui_scrollview *self, mgl_window *window) {
+    const double frame_time = mgui_get_seconds_since_last_update();
+    self->mouse_scroll.x *= max_float(0.0f, (1.0f - frame_time * SCROLL_DEACCEL));
+    self->mouse_scroll.y *= max_float(0.0f, (1.0f - frame_time * SCROLL_DEACCEL));
+
+    if(abs_float(self->mouse_scroll.x) < 0.0001f)
+        self->mouse_scroll.x = 0.0f;
+
+    if(abs_float(self->mouse_scroll.y) < 0.0001f)
+        self->mouse_scroll.y = 0.0f;
+
+    self->scroll.x += (int)self->mouse_scroll.x;
+    self->scroll.y += (int)self->mouse_scroll.y;
+
+    if(self->child_size.x > self->size.x) {
+        self->scroll.x = min_int(self->scroll.x, 0);
+        self->scroll.x = max_int(self->scroll.x, -self->child_size.x + self->size.x);
+    } else {
+        self->scroll.x = 0;
+    }
+
+    if(self->child_size.y > self->size.y) {
+        self->scroll.y = min_int(self->scroll.y, 0);
+        self->scroll.y = max_int(self->scroll.y, -self->child_size.y + self->size.y);
+    } else {
+        self->scroll.y = 0;
+    }
+
+    if(self->child) {
+        mgl_scissor prev_scissor;
+        mgl_window_get_scissor(window, &prev_scissor);
+
+        mgl_scissor new_scissor = {
+            .position = self->position,
+            .size = self->size
+        };
+        mgl_window_set_scissor(window, &new_scissor);
+
+        mgui_widget_set_position(self->child, (mgl_vec2i){ self->position.x + self->scroll.x, self->position.y + self->scroll.y });
+        self->child_size = mgui_widget_draw(self->child, window);
+
+        mgl_window_set_scissor(window, &prev_scissor);
+    } else {
+        self->child_size = (mgl_vec2i){ 0, 0 };
+    }
+
+    return self->child_size;
+}
diff --git a/src/mgui/widget.c b/src/mgui/widget.c
index 63bc97b..e9c8425 100644
--- a/src/mgui/widget.c
+++ b/src/mgui/widget.c
@@ -1,5 +1,6 @@
 #include "../../include/mgui/widget.h"
 #include "../../include/mgui/list.h"
+#include "../../include/mgui/scrollview.h"
 #include "../../include/mgui/button.h"
 #include "../../include/mgui/label.h"
 #include "../../include/mgui/image.h"
@@ -23,6 +24,9 @@ void mgui_widget_set_position(mgui_widget *self, mgl_vec2i position) {
         case MGUI_WIDGET_LIST:
             mgui_list_set_position(mgui_widget_to_list(self), position);
             break;
+        case MGUI_WIDGET_SCROLLVIEW:
+            mgui_scrollview_set_position(mgui_widget_to_scrollview(self), position);
+            break;
         case MGUI_WIDGET_BUTTON:
             mgui_button_set_position(mgui_widget_to_button(self), position);
             break;
@@ -40,6 +44,9 @@ void mgui_widget_set_width(mgui_widget *self, int width) {
         case MGUI_WIDGET_LIST:
             mgui_list_set_width(mgui_widget_to_list(self), width);
             break;
+        case MGUI_WIDGET_SCROLLVIEW:
+            mgui_scrollview_set_width(mgui_widget_to_scrollview(self), width);
+            break;
         case MGUI_WIDGET_BUTTON:
             mgui_button_set_width(mgui_widget_to_button(self), width);
             break;
@@ -57,6 +64,9 @@ void mgui_widget_on_event(mgui_widget *self, mgl_window *window, mgl_event *even
         case MGUI_WIDGET_LIST:
             mgui_list_on_event(mgui_widget_to_list(self), window, event);
             break;
+        case MGUI_WIDGET_SCROLLVIEW:
+            mgui_scrollview_on_event(mgui_widget_to_scrollview(self), window, event);
+            break;
         case MGUI_WIDGET_BUTTON:
             mgui_button_on_event(mgui_widget_to_button(self), window, event);
             break;
@@ -73,6 +83,8 @@ mgl_vec2i mgui_widget_draw(mgui_widget *self, mgl_window *window) {
     switch(self->type) {
         case MGUI_WIDGET_LIST:
             return mgui_list_draw(mgui_widget_to_list(self), window);
+        case MGUI_WIDGET_SCROLLVIEW:
+            return mgui_scrollview_draw(mgui_widget_to_scrollview(self), window);
         case MGUI_WIDGET_BUTTON:
             return mgui_button_draw(mgui_widget_to_button(self), window);
         case MGUI_WIDGET_LABEL: