gl: Add layout packer and various widgets.

* Move window setup and swap buffer calls into ui_begin/end.
* Rearrange source files.
* Simplify grab logic:
	Make it more robust in the face of user errors, such as setting
	ui.active to NULL explicitly.
* Copy text to primary selection as well.

1 files changed, 93 insertions, 12 deletions

diff --git a/platform/gl/gl-app.h b/platform/gl/gl-app.h
index 2aea2aed..6efb1ff7 100644
--- a/platform/gl/gl-app.h
+++ b/platform/gl/gl-app.h
@@ -6,6 +6,7 @@ int win_open_file(char *buf, int len);
 
 #include "mupdf/fitz.h"
 #include "mupdf/ucdn.h"
+#include "mupdf/pdf.h" /* for pdf specifics and forms */
 
 #ifndef __APPLE__
 #include <GL/freeglut.h>
@@ -13,7 +14,7 @@ int win_open_file(char *buf, int len);
 #include <GLUT/glut.h>
 #endif
 
-extern fz_context *ctx;
+/* UI */
 
 enum
 {
@@ -55,33 +56,62 @@ enum
 	KEY_F12,
 };
 
+enum side { ALL, T, R, B, L };
+enum fill { NONE = 0, X = 1, Y = 2, BOTH = 3 };
+enum anchor { CENTER, N, NE, E, SE, S, SW, W, NW };
+
+struct layout
+{
+	enum side side;
+	enum fill fill;
+	enum anchor anchor;
+	int padx, pady;
+};
+
 struct ui
 {
+	int window_w, window_h;
+
 	int x, y;
-	int down, middle, right;
+	int down, down_x, down_y;
+	int middle, middle_x, middle_y;
+	int right, right_x, right_y;
+
 	int scroll_x, scroll_y;
 	int key, mod, plain;
 
-	void *hot, *active, *focus;
+	int grab_down, grab_middle, grab_right;
+	const void *hot, *active, *focus;
 
 	int fontsize;
 	int baseline;
 	int lineheight;
+
+	struct layout *layout;
+	fz_irect *cavity;
+	struct layout layout_stack[32];
+	fz_irect cavity_stack[32];
 };
 
 extern struct ui ui;
 
+void ui_init(int w, int h, const char *title);
+void ui_quit(void);
+void ui_invalidate(void);
+void ui_finish(void);
+
 void ui_set_clipboard(const char *buf);
 const char *ui_get_clipboard(void);
 
-void ui_init_fonts(fz_context *ctx, float pixelsize);
-void ui_finish_fonts(fz_context *ctx);
-float ui_measure_character(fz_context *ctx, int ucs);
-void ui_begin_text(fz_context *ctx);
-float ui_draw_character(fz_context *ctx, int ucs, float x, float y);
-void ui_end_text(fz_context *ctx);
-float ui_draw_string(fz_context *ctx, float x, float y, const char *str);
-float ui_measure_string(fz_context *ctx, char *str);
+void ui_init_fonts(float pixelsize);
+void ui_finish_fonts(void);
+float ui_measure_character(int ucs);
+void ui_begin_text(void);
+float ui_draw_character(int ucs, float x, float y);
+void ui_end_text(void);
+
+float ui_draw_string(float x, float y, const char *str);
+float ui_measure_string(const char *str);
 
 struct texture
 {
@@ -90,12 +120,63 @@ struct texture
 	float s, t;
 };
 
+void ui_texture_from_pixmap(struct texture *tex, fz_pixmap *pix);
 void ui_draw_image(struct texture *tex, float x, float y);
 
+enum
+{
+	UI_INPUT_CANCEL = -1,
+	UI_INPUT_ACCEPT = 1,
+	UI_INPUT_CONTINUE = 0,
+};
+
 struct input
 {
 	char text[256];
 	char *end, *p, *q;
 };
 
-int ui_input(int x0, int y0, int x1, int y1, struct input *input);
+struct list
+{
+	fz_irect area;
+	int scroll_y;
+	int item_y;
+};
+
+void ui_begin(void);
+void ui_end(void);
+
+int ui_mouse_inside(fz_irect *area);
+
+void ui_layout(enum side side, enum fill fill, enum anchor anchor, int padx, int pady);
+fz_irect ui_pack_layout(int slave_w, int slave_h, enum side side, enum fill fill, enum anchor anchor, int padx, int pady);
+fz_irect ui_pack(int slave_w, int slave_h);
+void ui_pack_push(fz_irect cavity);
+void ui_pack_pop(void);
+
+void ui_panel_begin(int w, int h, int opaque);
+void ui_panel_end(void);
+
+void ui_spacer(void);
+void ui_label(const char *fmt, ...);
+int ui_button(const char *label);
+void ui_checkbox(const char *label, int *value);
+void ui_slider(float *value, float min, float max, int width);
+
+void ui_input_init(struct input *input, const char *text);
+int ui_input(struct input *input, int width);
+void ui_scrollbar(int x0, int y0, int x1, int y1, int *value, int page_size, int max);
+
+void ui_list_begin(struct list *list, int count, int req_w, int req_h);
+int ui_list_item(struct list *list, void *id, int indent, const char *label, int selected);
+void ui_list_end(struct list *list);
+
+/* App */
+
+extern fz_context *ctx;
+extern pdf_document *pdf;
+extern pdf_page *page;
+extern fz_matrix page_ctm, page_inv_ctm;
+extern int page_x_ofs, page_y_ofs;
+
+void run_main_loop(void);