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A nasty GTK signal cascade was causing any edit box whose contents

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was modified on session load to be blanked. More details in the
comment in dlg_editbox_set().

[originally from svn r7161]
This commit is contained in:
Simon Tatham 2007-01-25 19:47:36 +00:00
parent a3da28f607
commit ac7870a635
1 changed files with 47 additions and 22 deletions
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69
unix/gtkdlg.c
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@ -56,6 +56,7 @@ struct uctrl {
GtkWidget *text; /* for text */
GtkWidget *label; /* for dlg_label_change */
GtkAdjustment *adj; /* for the scrollbar in a list box */
guint entrysig;
guint textsig;
};
@ -102,12 +103,12 @@ static gboolean widget_focus(GtkWidget *widget, GdkEventFocus *event,
static void shortcut_add(struct Shortcuts *scs, GtkWidget *labelw,
int chr, int action, void *ptr);
static void shortcut_highlight(GtkWidget *label, int chr);
static int listitem_single_key(GtkWidget *item, GdkEventKey *event,
gpointer data);
static int listitem_multi_key(GtkWidget *item, GdkEventKey *event,
gpointer data);
static int listitem_button(GtkWidget *item, GdkEventButton *event,
gpointer data);
static gboolean listitem_single_key(GtkWidget *item, GdkEventKey *event,
gpointer data);
static gboolean listitem_multi_key(GtkWidget *item, GdkEventKey *event,
gpointer data);
static gboolean listitem_button(GtkWidget *item, GdkEventButton *event,
gpointer data);
static void menuitem_activate(GtkMenuItem *item, gpointer data);
static void coloursel_ok(GtkButton *button, gpointer data);
static void coloursel_cancel(GtkButton *button, gpointer data);
@ -300,7 +301,27 @@ void dlg_editbox_set(union control *ctrl, void *dlg, char const *text)
struct uctrl *uc = dlg_find_byctrl(dp, ctrl);
assert(uc->ctrl->generic.type == CTRL_EDITBOX);
assert(uc->entry != NULL);
/*
* GTK 2 implements gtk_entry_set_text by means of two separate
* operations: first delete the previous text leaving the empty
* string, then insert the new text. This causes two calls to
* the "changed" signal.
*
* The first call to "changed", if allowed to proceed normally,
* will cause an EVENT_VALCHANGE event on the edit box, causing
* a call to dlg_editbox_get() which will read the empty string
* out of the GtkEntry - and promptly write it straight into
* the Config structure, which is precisely where our `text'
* pointer is probably pointing, so the second editing
* operation will insert that instead of the string we
* originally asked for.
*
* Hence, we must block our "changed" signal handler for the
* duration of this call to gtk_entry_set_text.
*/
g_signal_handler_block(uc->entry, uc->entrysig);
gtk_entry_set_text(GTK_ENTRY(uc->entry), text);
g_signal_handler_unblock(uc->entry, uc->entrysig);
}
void dlg_editbox_get(union control *ctrl, void *dlg, char *buffer, int length)
@ -963,7 +984,8 @@ static void button_toggled(GtkToggleButton *tb, gpointer data)
uc->ctrl->generic.handler(uc->ctrl, dp, dp->data, EVENT_VALCHANGE);
}
static int editbox_key(GtkWidget *widget, GdkEventKey *event, gpointer data)
static gboolean editbox_key(GtkWidget *widget, GdkEventKey *event,
gpointer data)
{
/*
* GtkEntry has a nasty habit of eating the Return key, which
@ -975,7 +997,7 @@ static int editbox_key(GtkWidget *widget, GdkEventKey *event, gpointer data)
* in the dialog just like it will everywhere else.
*/
if (event->keyval == GDK_Return && widget->parent != NULL) {
gint return_val;
gboolean return_val;
gtk_signal_emit_stop_by_name(GTK_OBJECT(widget), "key_press_event");
gtk_signal_emit_by_name(GTK_OBJECT(widget->parent), "key_press_event",
event, &return_val);
@ -993,16 +1015,17 @@ static void editbox_changed(GtkEditable *ed, gpointer data)
}
}
static void editbox_lostfocus(GtkWidget *ed, GdkEventFocus *event,
gpointer data)
static gboolean editbox_lostfocus(GtkWidget *ed, GdkEventFocus *event,
gpointer data)
{
struct dlgparam *dp = (struct dlgparam *)data;
struct uctrl *uc = dlg_find_bywidget(dp, GTK_WIDGET(ed));
uc->ctrl->generic.handler(uc->ctrl, dp, dp->data, EVENT_REFRESH);
return FALSE;
}
static int listitem_key(GtkWidget *item, GdkEventKey *event, gpointer data,
int multiple)
static gboolean listitem_key(GtkWidget *item, GdkEventKey *event,
gpointer data, int multiple)
{
GtkAdjustment *adj = GTK_ADJUSTMENT(data);
@ -1095,20 +1118,20 @@ static int listitem_key(GtkWidget *item, GdkEventKey *event, gpointer data,
return FALSE;
}
static int listitem_single_key(GtkWidget *item, GdkEventKey *event,
gpointer data)
static gboolean listitem_single_key(GtkWidget *item, GdkEventKey *event,
gpointer data)
{
return listitem_key(item, event, data, FALSE);
}
static int listitem_multi_key(GtkWidget *item, GdkEventKey *event,
gpointer data)
static gboolean listitem_multi_key(GtkWidget *item, GdkEventKey *event,
gpointer data)
{
return listitem_key(item, event, data, TRUE);
}
static int listitem_button(GtkWidget *item, GdkEventButton *event,
gpointer data)
static gboolean listitem_button(GtkWidget *item, GdkEventButton *event,
gpointer data)
{
struct dlgparam *dp = (struct dlgparam *)data;
if (event->type == GDK_2BUTTON_PRESS ||
@ -1500,8 +1523,9 @@ GtkWidget *layout_ctrls(struct dlgparam *dp, struct Shortcuts *scs,
gtk_entry_set_visibility(GTK_ENTRY(w), FALSE);
uc->entry = w;
}
gtk_signal_connect(GTK_OBJECT(uc->entry), "changed",
GTK_SIGNAL_FUNC(editbox_changed), dp);
uc->entrysig =
gtk_signal_connect(GTK_OBJECT(uc->entry), "changed",
GTK_SIGNAL_FUNC(editbox_changed), dp);
gtk_signal_connect(GTK_OBJECT(uc->entry), "key_press_event",
GTK_SIGNAL_FUNC(editbox_key), dp);
gtk_signal_connect(GTK_OBJECT(uc->entry), "focus_in_event",
@ -1592,8 +1616,9 @@ GtkWidget *layout_ctrls(struct dlgparam *dp, struct Shortcuts *scs,
gtk_signal_connect(GTK_OBJECT(uc->entry), "key_press_event",
GTK_SIGNAL_FUNC(editbox_key), dp);
gtk_signal_connect(GTK_OBJECT(uc->entry), "changed",
GTK_SIGNAL_FUNC(editbox_changed), dp);
uc->entrysig =
gtk_signal_connect(GTK_OBJECT(uc->entry), "changed",
GTK_SIGNAL_FUNC(editbox_changed), dp);
gtk_signal_connect(GTK_OBJECT(uc->entry), "focus_in_event",
GTK_SIGNAL_FUNC(widget_focus), dp);
gtk_signal_connect(GTK_OBJECT(uc->button), "focus_in_event",