/** fontposition.c **/
#include <gnome.h>

#define HEIGHT 100
#define WIDTH 300

#define STRING_LEFT 1
#define STRING_CENTER 2
#define STRING_RIGHT 3
#define STRING_TOP 1
#define STRING_MIDDLE 2
#define STRING_BOTTOM 3

typedef struct {
    GdkFont *font;
    GtkWidget *drawingArea;
    gint horizontal;
    gint vertical;
} Context;

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
void eventFontSet(GtkWidget *widget,
        gchar *string,Context *context);
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,Context *context);
void topButton(GtkWidget *widget,Context *context);
void middleButton(GtkWidget *widget,Context *context);
void bottomButton(GtkWidget *widget,Context *context);
void leftButton(GtkWidget *widget,Context *context);
void centerButton(GtkWidget *widget,Context *context);
void rightButton(GtkWidget *widget,Context *context);
static GtkWidget *createPositionWidget(Context *context);

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *position;
    Context context =
        { NULL, NULL, STRING_RIGHT, STRING_MIDDLE };

    gnome_init("fontposition","1.0",argc,argv);
    app = gnome_app_new("fontposition","Font Position");
    gtk_container_set_border_width(GTK_CONTAINER(app),30);
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy),NULL);

    position = createPositionWidget(&context);

    gnome_app_set_contents(GNOME_APP(app),position);
    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
static GtkWidget *createPositionWidget(Context *context)
{
    GtkWidget *position;
    GtkWidget *box;
    GtkWidget *button;
    GtkWidget *frame;
    GtkWidget *fontpicker;

    position = gtk_vbox_new(FALSE,0);

    box = gtk_hbox_new(TRUE,10);
    button = gtk_button_new_with_label("Top");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(topButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    button = gtk_button_new_with_label("Middle");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(middleButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    button = gtk_button_new_with_label("Bottom");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(bottomButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    gtk_box_pack_start(GTK_BOX(position),box,
            FALSE,FALSE,0);

    context->drawingArea = gtk_drawing_area_new();
    gtk_drawing_area_size(
            GTK_DRAWING_AREA(context->drawingArea),
            WIDTH,HEIGHT);
    gtk_signal_connect(GTK_OBJECT(context->drawingArea),
            "event",GTK_SIGNAL_FUNC(eventDraw),context);

    frame = gtk_frame_new(NULL);
    gtk_container_add(GTK_CONTAINER(frame),
            context->drawingArea);
    gtk_box_pack_start(GTK_BOX(position),frame,
            FALSE,FALSE,0);

    box = gtk_hbox_new(TRUE,10);
    button = gtk_button_new_with_label("Left");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(leftButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    button = gtk_button_new_with_label("Center");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(centerButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    button = gtk_button_new_with_label("Right");
    gtk_signal_connect(GTK_OBJECT(button),"clicked",
            GTK_SIGNAL_FUNC(rightButton),context);
    gtk_box_pack_start(GTK_BOX(box),button,
            FALSE,TRUE,0);
    gtk_box_pack_start(GTK_BOX(position),box,
            FALSE,FALSE,0);

    fontpicker = gnome_font_picker_new();
    gtk_signal_connect(GTK_OBJECT(fontpicker),"font-set",
            GTK_SIGNAL_FUNC(eventFontSet),context);
    gtk_box_pack_start(GTK_BOX(position),fontpicker,
            FALSE,FALSE,0);

    return(position);
}
void eventFontSet(GtkWidget *widget,
        gchar *string,Context *context) {

    if(context->font != NULL)
        gdk_font_unref(context->font);
    context->font = gdk_font_load(string);
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
gboolean eventDraw(GtkWidget *widget,
        GdkEvent *event,Context *context) {
    gchar outstring[40];
    gint lbearing;
    gint rbearing;
    gint width;
    gint ascent;
    gint descent;
    gint x;
    gint y;

    if(context->font == NULL) {
        context->font = gdk_font_load(
      "-*-bookman-light-r-normal--14-*-*-*-p-*-iso8859-1");
    }

    switch(context->vertical) {
    case STRING_TOP:
        strcpy(outstring,"Top");
        break;
    case STRING_MIDDLE:
        strcpy(outstring,"Middle");
        break;
    case STRING_BOTTOM:
        strcpy(outstring,"Bottom");
        break;
    }
    switch(context->horizontal) {
    case STRING_LEFT:
        strcat(outstring," Left");
        break;
    case STRING_CENTER:
        strcat(outstring," Center");
        break;
    case STRING_RIGHT:
        strcat(outstring," Right");
        break;
    }

    gdk_text_extents(context->font,
                outstring,
                strlen(outstring),
                &lbearing,
                &rbearing,
                &width,
                &ascent,
                &descent);

    switch(context->vertical) {
    case STRING_TOP:
        y = ascent;
        break;
    case STRING_MIDDLE:
        y = HEIGHT / 2;
        y += (ascent - descent) / 2;
        break;
    case STRING_BOTTOM:
        y = HEIGHT - descent;
        break;
    }
    switch(context->horizontal) {
    case STRING_LEFT:
        x = 0;
        break;
    case STRING_CENTER:
        x = (WIDTH / 2) - (width / 2);
        break;
    case STRING_RIGHT:
        x = WIDTH - width;
        break;
    }

    gdk_draw_string(widget->window,
            context->font,
            context->drawingArea->style->black_gc,
            x,y,
            outstring);

    return(TRUE);
}
void topButton(GtkWidget *widget,Context *context) {
    context->vertical = STRING_TOP;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
void middleButton(GtkWidget *widget,Context *context) {
    context->vertical = STRING_MIDDLE;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
void bottomButton(GtkWidget *widget,Context *context) {
    context->vertical = STRING_BOTTOM;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
void leftButton(GtkWidget *widget,Context *context) {
    context->horizontal = STRING_LEFT;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
void centerButton(GtkWidget *widget,Context *context) {
    context->horizontal = STRING_CENTER;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
void rightButton(GtkWidget *widget,Context *context) {
    context->horizontal = STRING_RIGHT;
    gdk_window_clear_area_e(context->drawingArea->window,
            0,0,WIDTH,HEIGHT);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}