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More GTK+ uiArea work. Not sure what I'll do about DPI; GTK+ handles scaling for us...

This commit is contained in:
Pietro Gagliardi 2015-09-06 16:20:37 -04:00
parent 8344ed5f17
commit 33c1852e21
3 changed files with 41 additions and 28 deletions
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41
gtkarea/area.c
View File

@ -7,6 +7,7 @@ struct areaPrivate {
GtkAdjustment *ha;
GtkAdjustment *va;
// TODO get rid of the need for these
int clientWidth;
int clientHeight;
// needed for GtkScrollable
@ -118,33 +119,24 @@ static gboolean areaWidget_draw(GtkWidget *w, cairo_t *cr)
{
areaWidget *a = areaWidget(w);
struct areaPrivate *ap = a->priv;
char *msg;
PangoLayout *layout;
int ypos;
int height;
uiAreaDrawParams dp;
double clipX0, clipY0, clipX1, clipY1;
ypos = 5;
// TODO dp.Context
msg = g_strdup_printf("client width %d height %d",
ap->clientWidth, ap->clientHeight);
layout = gtk_widget_create_pango_layout(GTK_WIDGET(a), msg);
cairo_move_to(cr, 5, ypos);
pango_cairo_show_layout(cr, layout);
pango_layout_get_pixel_size(layout, NULL, &height);
ypos += height;
g_object_unref(layout);
g_free(msg);
dp.ClientWidth = ap->clientWidth;
dp.ClientHeight = ap->clientHeight;
msg = g_strdup_printf("hscroll %d vscroll %d",
(int) gtk_adjustment_get_value(ap->ha),
(int) gtk_adjustment_get_value(ap->va));
layout = gtk_widget_create_pango_layout(GTK_WIDGET(a), msg);
cairo_move_to(cr, 5, ypos);
pango_cairo_show_layout(cr, layout);
pango_layout_get_pixel_size(layout, NULL, &height);
ypos += height;
g_object_unref(layout);
g_free(msg);
cairo_clip_extents(cr, &clipX0, &clipY0, &clipX1, &clipY1);
dp.ClipX = clipX0;
dp.ClipY = clipY0;
dp.ClipWidth = clipX1 - clipX0;
dp.ClipHeight = clipY1 - clipY0;
dp.HScrollPos = gtk_adjustment_get_value(ap->ha);
dp.VScrollPos = gtk_adjustment_get_value(ap->va);
(*(ap->ah->Draw))(ap->ah, ap->a, &dp);
return FALSE;
}
@ -168,6 +160,7 @@ static GParamSpec *pspecAreaHandler;
static void onValueChanged(GtkAdjustment *a, gpointer data)
{
// there's no way to scroll the contents of a widget, so we have to redraw the entire thing
gtk_widget_queue_draw(GTK_WIDGET(data));
}

8
gtkarea/main.c
View File

@ -12,6 +12,11 @@ static struct handler h;
static GtkWidget *nhspinb;
static GtkWidget *nvspinb;
static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *params)
{
// TODO
}
static uintmax_t handlerHScrollMax(uiAreaHandler *a, uiArea *area)
{
return gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(nhspinb));
@ -44,6 +49,7 @@ int main(void)
GtkWidget *scroller;
GtkWidget *grid;
h.ah.Draw = handlerDraw;
h.ah.HScrollMax = handlerHScrollMax;
h.ah.VScrollMax = handlerVScrollMax;
@ -63,8 +69,6 @@ int main(void)
gtk_widget_set_valign(scroller, GTK_ALIGN_FILL);
gtk_container_add(GTK_CONTAINER(box), scroller);
// TODO area
grid = gtk_grid_new();
gtk_widget_set_halign(grid, GTK_ALIGN_START);
gtk_container_add(GTK_CONTAINER(box), grid);

20
gtkarea/ui.h
View File

@ -5,9 +5,25 @@ typedef struct uiAreaHandler uiAreaHandler;
typedef struct uiAreaDrawParams uiAreaDrawParams;
struct uiAreaHandler {
// TODO draw
void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
};
// TODO uiAreaDrawParams
struct uiAreaDrawParams {
// TODO context
intmax_t ClientWidth;
intmax_t ClientHeight;
intmax_t ClipX;
intmax_t ClipY;
intmax_t ClipWidth;
intmax_t ClipHeight;
//TODO xxxx DPIX;
//TODO xxxx DPIY;
intmax_t HScrollPos;
intmax_t VScrollPos;
};