ui/gtk/graphics.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "graphics.h"
#include "container.h"
#include "../common/object.h"

#if GTK_CHECK_VERSION(3, 0, 0)
#include "draw_cairo.h"
#endif

static void destroy_drawingarea(GtkWidget *widget, UiDrawingArea *drawingarea) {
    free(drawingarea);
}

static void drawingarea_draw(UiDrawingArea *drawingarea, cairo_t *cr, int width, int height) {
    UiEvent event;
    event.obj = drawingarea->obj;
    event.window = event.obj->window;
    event.document = event.obj->ctx->document;
    event.eventdata = NULL;
    event.eventdatatype = 0;
    event.intval = 0;
    event.set = 0;
    
    
}

#if GTK_CHECK_VERSION(4, 0, 0)
static void drawfunc(
        GtkDrawingArea *area,
        cairo_t *cr,
        int width,
        int  height,
        gpointer userdata)
{
    ui_drawingarea_draw(userdata, cr, width, height);
}
#elif GTK_CHECK_VERSION(3, 0, 0)
gboolean draw_callback(GtkWidget *widget, cairo_t *cr, UiDrawingArea *drawingarea) {
    int width = gtk_widget_get_allocated_width(widget);
    int height = gtk_widget_get_allocated_height(widget);
    ui_drawingarea_draw(drawingarea, cr, width, height);
    return FALSE;
}
#endif

UIWIDGET ui_drawingarea_create(UiObject *obj, UiDrawingAreaArgs *args) {
    GtkWidget *widget = gtk_drawing_area_new();
    ui_set_name_and_style(widget, args->name, args->style_class);
    
    gtk_drawing_area_set_content_width(GTK_DRAWING_AREA(widget), args->width > 0 ? args->width : 100);
    gtk_drawing_area_set_content_height(GTK_DRAWING_AREA(widget), args->height > 0 ? args->height : 100);
    
    UiContainerPrivate *ct = (UiContainerPrivate*)obj->container_end;
    UiLayout layout = UI_ARGS2LAYOUT(args);
    ct->add(ct, widget, &layout);
    
    UiDrawingArea *drawingarea = malloc(sizeof(UiDrawingArea));
    drawingarea->obj = obj;
    drawingarea->widget = widget;
    drawingarea->draw = args->draw;
    drawingarea->drawdata = args->drawdata;
    drawingarea->onclick = args->onclick;
    drawingarea->onclickdata = args->onclickdata;
    drawingarea->onmotion = args->onmotion;
    drawingarea->onmotiondata = args->onmotiondata;
    
#if GTK_CHECK_VERSION(4, 0, 0)
    gtk_drawing_area_set_draw_func(GTK_DRAWING_AREA(widget), drawfunc, drawingarea, NULL);
#elif GTK_CHECK_VERSION(3, 0, 0)
    g_signal_connect(
            widget,
            "draw",
            G_CALLBACK(draw_callback),
            NULL);
#endif
    
    g_signal_connect(
                widget,
                "destroy",
                G_CALLBACK(destroy_drawingarea),
                drawingarea);
    
    return widget;
}


#if GTK_MAJOR_VERSION <= 3
static gboolean widget_button_pressed(
        GtkWidget *widget,
        GdkEvent *event,
        gpointer userdata)
{
    UiEventData *eventdata = userdata;
    
    UiMouseEvent me;
    me.x = (int)event->button.x;
    me.y = (int)event->button.y;
    
    int exec = 0;
    if(event->button.type == GDK_BUTTON_PRESS) {
        exec = 1;
        me.type = UI_PRESS;
    } else if(event->button.type == GDK_2BUTTON_PRESS) {
        exec = 1;
        me.type = UI_PRESS2;
    }
    
    if(exec) {
        UiEvent e;
        e.obj = eventdata->obj;
        e.window = eventdata->obj->window;
        e.document = eventdata->obj->ctx->document;
        e.eventdata = &me;
        e.intval = 0;
        eventdata->callback(&e, eventdata->userdata);
    }
    return TRUE;
}
#endif

void ui_drawingarea_getsize(UIWIDGET drawingarea, int *width, int *height) {
#if GTK_MAJOR_VERSION >= 4
    *width = gtk_widget_get_width(drawingarea);
    *height = gtk_widget_get_height(drawingarea);
#elif GTK_MAJOR_VERSION == 3
    *width = gtk_widget_get_allocated_width(drawingarea);
    *height = gtk_widget_get_allocated_height(drawingarea);
#else
    *width = drawingarea->allocation.width;
    *height = drawingarea->allocation.height;
#endif
}

void ui_drawingarea_redraw(UIWIDGET drawingarea) {
    gtk_widget_queue_draw(drawingarea);
}

void ui_drawingarea_mousehandler(UiObject *obj, UIWIDGET widget, ui_callback f, void *u) {
#if GTK_MAJOR_VERSION >= 4
    // TODO
#else
    gtk_widget_set_events(widget, GDK_BUTTON_PRESS_MASK);
    if(f) {
        UiEventData *event = malloc(sizeof(UiEventData));
        event->obj = obj;
        event->callback = f;
        event->userdata = u;
        event->customdata = NULL;
        event->value = 0;
        
        g_signal_connect(G_OBJECT(widget),
                "button-press-event",
                G_CALLBACK(widget_button_pressed),
                event);
    } else {
         // TODO: warning
    }
#endif
}


// text layout
UiTextLayout* ui_text(UiGraphics *g) {
    UiTextLayout *layout = malloc(sizeof(UiTextLayout));
    PangoContext *pc = ui_get_pango_context(g);
    layout->layout = pango_layout_new(pc);
    return layout;
}

void ui_text_setstring(UiTextLayout *layout, char *str) {
    pango_layout_set_text(layout->layout, str, -1);
}

void ui_text_setstringl(UiTextLayout *layout, char *str, int len) {
    pango_layout_set_text(layout->layout, str, len);
}

void ui_text_setfont(UiTextLayout *layout, const char *font, int size) {
    PangoFontDescription *fontDesc;
    fontDesc = pango_font_description_from_string(font);
    pango_font_description_set_size(fontDesc, size * PANGO_SCALE);
    pango_layout_set_font_description(layout->layout, fontDesc);
    pango_font_description_free(fontDesc);
}

void ui_text_getsize(UiTextLayout *layout, int *width, int *height) {
    pango_layout_get_size(layout->layout, width, height);
    *width = *width / PANGO_SCALE;
    *height = *height / PANGO_SCALE;
}

void ui_text_setwidth(UiTextLayout *layout, int width) {
    pango_layout_set_width(layout->layout, width * PANGO_SCALE);
    pango_layout_set_ellipsize(layout->layout, PANGO_ELLIPSIZE_END);
    //pango_layout_set_wrap(layout->layout, PANGO_WRAP_WORD_CHAR);
}

void ui_text_free(UiTextLayout *text) {
    g_object_unref(text->layout);
    free(text);
}