[gtk+/wip/attach-params: 1/20] gdkattachparams: add GdkAttachParams
- From: William Hua <williamhua src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/wip/attach-params: 1/20] gdkattachparams: add GdkAttachParams
- Date: Fri, 15 Jan 2016 20:34:12 +0000 (UTC)
commit 21acbf028efaaa213fb304b42b4b1cb363d0ab34
Author: William Hua <william hua canonical com>
Date: Wed Jan 6 12:00:00 2016 -0500
gdkattachparams: add GdkAttachParams
https://bugzilla.gnome.org/show_bug.cgi?id=756579
docs/reference/gdk/Makefile.am | 2 +
docs/reference/gdk/gdk-docs.sgml | 1 +
docs/reference/gdk/gdk3-sections.txt | 27 +
docs/reference/gdk/images/gdkattachparams.png | Bin 0 -> 19297 bytes
docs/reference/gdk/images/gdkattachparams.svg | 729 +++++++++++++++++++++
docs/reference/gdk/images/gdkattachrule.png | Bin 0 -> 29487 bytes
gdk/Makefile.am | 3 +
gdk/gdk.h | 1 +
gdk/gdkattachparams.c | 847 +++++++++++++++++++++++++
gdk/gdkattachparams.h | 153 +++++
gdk/gdkattachparamsprivate.h | 75 +++
11 files changed, 1838 insertions(+), 0 deletions(-)
---
diff --git a/docs/reference/gdk/Makefile.am b/docs/reference/gdk/Makefile.am
index aef7cab..857c8db 100644
--- a/docs/reference/gdk/Makefile.am
+++ b/docs/reference/gdk/Makefile.am
@@ -85,6 +85,8 @@ HTML_IMAGES = \
images/draped_box.png \
images/exchange.png \
images/fleur.png \
+ images/gdkattachparams.png \
+ images/gdkattachrule.png \
images/gobbler.png \
images/gumby.png \
images/hand1.png \
diff --git a/docs/reference/gdk/gdk-docs.sgml b/docs/reference/gdk/gdk-docs.sgml
index fdd36a4..6962b4d 100644
--- a/docs/reference/gdk/gdk-docs.sgml
+++ b/docs/reference/gdk/gdk-docs.sgml
@@ -47,6 +47,7 @@
<xi:include href="xml/wayland_interaction.xml" />
<xi:include href="xml/gdkapplaunchcontext.xml" />
<xi:include href="xml/gdktestutils.xml" />
+ <xi:include href="xml/gdkattachparams.xml" />
</reference>
<reference>
diff --git a/docs/reference/gdk/gdk3-sections.txt b/docs/reference/gdk/gdk3-sections.txt
index 7b1b9f7..5bb6217 100644
--- a/docs/reference/gdk/gdk3-sections.txt
+++ b/docs/reference/gdk/gdk3-sections.txt
@@ -551,6 +551,33 @@ gdk_fullscreen_mode_get_type
</SECTION>
<SECTION>
+<TITLE>Attachment Parameters</TITLE>
+<FILE>gdkattachparams</FILE>
+GdkAttachParams
+GdkAttachRule
+GdkAttachCallback
+gdk_attach_params_new
+gdk_attach_params_free
+gdk_attach_params_set_attach_rect
+gdk_attach_params_set_attach_margin
+gdk_attach_params_set_window_padding
+gdk_attach_params_set_window_offset
+gdk_attach_params_add_primary_rules
+gdk_attach_params_add_secondary_rules
+gdk_attach_params_add_primary_rules_valist
+gdk_attach_params_add_secondary_rules_valist
+gdk_attach_params_primary_rules_foreach
+gdk_attach_params_secondary_rules_foreach
+gdk_attach_params_set_position_callback
+
+<SUBSECTION Private>
+_GdkAttachParams
+gdk_attach_params_choose_position
+gdk_attach_params_choose_position_for_window
+gdk_attach_params_move_window
+</SECTION>
+
+<SECTION>
<TITLE>Selections</TITLE>
<FILE>selections</FILE>
GDK_SELECTION_PRIMARY
diff --git a/docs/reference/gdk/images/gdkattachparams.png b/docs/reference/gdk/images/gdkattachparams.png
new file mode 100644
index 0000000..8695098
Binary files /dev/null and b/docs/reference/gdk/images/gdkattachparams.png differ
diff --git a/docs/reference/gdk/images/gdkattachparams.svg b/docs/reference/gdk/images/gdkattachparams.svg
new file mode 100644
index 0000000..2d9c965
--- /dev/null
+++ b/docs/reference/gdk/images/gdkattachparams.svg
@@ -0,0 +1,729 @@
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diff --git a/docs/reference/gdk/images/gdkattachrule.png b/docs/reference/gdk/images/gdkattachrule.png
new file mode 100644
index 0000000..54c1351
Binary files /dev/null and b/docs/reference/gdk/images/gdkattachrule.png differ
diff --git a/gdk/Makefile.am b/gdk/Makefile.am
index 84942ce..4314865 100644
--- a/gdk/Makefile.am
+++ b/gdk/Makefile.am
@@ -63,6 +63,7 @@ gdk_public_h_sources = \
gdk.h \
gdk-autocleanup.h \
gdkapplaunchcontext.h \
+ gdkattachparams.h \
gdkcairo.h \
gdkcursor.h \
gdkdevice.h \
@@ -103,6 +104,7 @@ gdk_h_sources = \
gdk_private_headers = \
gdk-private.h \
gdkapplaunchcontextprivate.h \
+ gdkattachparamsprivate.h \
gdkcursorprivate.h \
gdkdevicemanagerprivate.h \
gdkdeviceprivate.h \
@@ -129,6 +131,7 @@ gdk_c_sources = \
gdk-private.c \
gdk.c \
gdkapplaunchcontext.c \
+ gdkattachparams.c \
gdkcairo.c \
gdkcursor.c \
gdkdeprecated.c \
diff --git a/gdk/gdk.h b/gdk/gdk.h
index 81ba765..869f6bf 100644
--- a/gdk/gdk.h
+++ b/gdk/gdk.h
@@ -30,6 +30,7 @@
#include <gdk/gdkconfig.h>
#include <gdk/gdkversionmacros.h>
#include <gdk/gdkapplaunchcontext.h>
+#include <gdk/gdkattachparams.h>
#include <gdk/gdkcairo.h>
#include <gdk/gdkcursor.h>
#include <gdk/gdkdevice.h>
diff --git a/gdk/gdkattachparams.c b/gdk/gdkattachparams.c
new file mode 100644
index 0000000..bedee37
--- /dev/null
+++ b/gdk/gdkattachparams.c
@@ -0,0 +1,847 @@
+#include "config.h"
+
+#include "gdkattachparamsprivate.h"
+#include "gdkscreen.h"
+#include "gdkwindow.h"
+
+/**
+ * SECTION: gdkattachparams
+ * @section_id: gdkattachparams
+ * @title: Attachment Parameters
+ * @short_description: Describing relative window position
+ * @stability: Unstable
+ * @include: gdk/gdkattachparams.h
+ *
+ * A full description of how a window should be positioned relative to an
+ * attachment rectangle.
+ *
+ * Certain widgets such as menus and combo boxes don't require explicit
+ * absolute positioning; they only need to be aligned with respect to another
+ * anchoring widget, such as a menu item, in such a way to not overflow
+ * off-screen. GTK+ cannot always determine such an optimal position since it
+ * requires knowledge of the geometry of the monitor workarea as well as the
+ * ability to position windows in absolute root window coordinates, which some
+ * GDK backends do not support.
+ *
+ * A minimal #GdkAttachParams description should have an attachment rectangle,
+ * a list of primary constraints, and a list of secondary constraints. The
+ * attachment rectangle is the allocation of the anchoring widget, which can
+ * be a menu item, menu button, combo box, etc. It can even be a 1x1 pixel at
+ * the current cursor position. The primary constraints are a list of
+ * #GdkAttachRules in descending priority that the GDK backend can try in order
+ * to fix the position of the window either horizontally or vertically. The
+ * secondary constraints are a list of #GdkAttachRules in descending priority
+ * to fix the position of the window on the other axis.
+ *
+ * 
+ *
+ * A #GdkAttachRule is a bit mask that constrains the position of a window on a
+ * single axis: %GDK_ATTACH_AXIS_X or %GDK_ATTACH_AXIS_Y. It must also specify
+ * one of %GDK_ATTACH_RECT_MIN, %GDK_ATTACH_RECT_MID, or %GDK_ATTACH_RECT_MAX,
+ * and one of %GDK_ATTACH_WINDOW_MIN, %GDK_ATTACH_WINDOW_MID, or
+ * %GDK_ATTACH_WINDOW_MAX. The backend will make a best effort to align the
+ * window position to the attachment rectangle position on that axis, or move
+ * on to the next constraint if available.
+ *
+ * 
+ *
+ * There are also additional parameters that can be set to fine tune the
+ * positioning of the window, such as margins and paddings, as well as a
+ * callback to obtain the final position of the window.
+ *
+ * Since: 3.20
+ */
+
+/**
+ * gdk_attach_params_new:
+ *
+ * Creates a new #GdkAttachParams for describing the position of a #GdkWindow
+ * relative to an attachment #GdkRectangle.
+ *
+ * Returns: (transfer full): a new #GdkAttachParams, to be freed with
+ * gdk_attach_params_free()
+ *
+ * Since: 3.20
+ */
+GdkAttachParams *
+gdk_attach_params_new (void)
+{
+ GdkAttachParams *params = g_new0 (GdkAttachParams, 1);
+
+ params->primary_rules = g_array_new (TRUE, TRUE, sizeof (GdkAttachRule));
+ params->secondary_rules = g_array_new (TRUE, TRUE, sizeof (GdkAttachRule));
+
+ return params;
+}
+
+/**
+ * gdk_attach_params_free:
+ * @data: the #GdkAttachParams to free
+ *
+ * Releases @data.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_free (gpointer data)
+{
+ GdkAttachParams *params;
+
+ g_return_if_fail (data);
+
+ params = data;
+
+ if (params->attach_user_data && params->attach_destroy_notify)
+ params->attach_destroy_notify (params->attach_user_data);
+
+ g_array_unref (params->secondary_rules);
+ g_array_unref (params->primary_rules);
+
+ g_clear_object (¶ms->attach_parent);
+
+ g_free (params);
+}
+
+/**
+ * gdk_attach_params_set_attach_rect:
+ * @params: a #GdkAttachParams
+ * @rectangle: (nullable): the attachment rectangle
+ * @parent: (nullable): the #GdkWindow that @rectangle is relative to
+ *
+ * Sets the attachment rectangle the window needs to be aligned relative to.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_attach_rect (GdkAttachParams *params,
+ const GdkRectangle *rectangle,
+ GdkWindow *parent)
+{
+ g_return_if_fail (params);
+
+ if (rectangle)
+ {
+ params->has_attach_rect = TRUE;
+ params->attach_rect = *rectangle;
+ g_set_object (¶ms->attach_parent, parent);
+ }
+ else
+ {
+ params->has_attach_rect = FALSE;
+ g_clear_object (¶ms->attach_parent);
+ }
+}
+
+/**
+ * gdk_attach_params_set_attach_margin:
+ * @params: a #GdkAttachParams
+ * @margin: (nullable): the space around the attachment rectangle
+ *
+ * Sets the amount of space to leave around the attachment rectangle.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_attach_margin (GdkAttachParams *params,
+ const GdkBorder *margin)
+{
+ GdkBorder zero = { 0 };
+
+ g_return_if_fail (params);
+
+ params->attach_margin = margin ? *margin : zero;
+}
+
+/**
+ * gdk_attach_params_set_window_padding:
+ * @params: a #GdkAttachParams
+ * @padding: (nullable): the space between the window and its
+ * contents.
+ *
+ * Sets the amount of space between the window and its contents.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_window_padding (GdkAttachParams *params,
+ const GdkBorder *padding)
+{
+ GdkBorder zero = { 0 };
+
+ g_return_if_fail (params);
+
+ params->window_padding = padding ? *padding : zero;
+}
+
+/**
+ * gdk_attach_params_set_window_offset:
+ * @params: a #GdkAttachParams
+ * @x: horizontal displacement
+ * @y: vertical displacement
+ *
+ * Sets the offset to displace the window by.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_window_offset (GdkAttachParams *params,
+ gint x,
+ gint y)
+{
+ g_return_if_fail (params);
+
+ params->offset_x = x;
+ params->offset_y = y;
+}
+
+static void
+add_rules (GArray *array,
+ GdkAttachRule first_rule,
+ va_list args)
+{
+ GdkAttachRule rule;
+
+ for (rule = first_rule; rule; rule = va_arg (args, GdkAttachRule))
+ g_array_append_val (array, rule);
+}
+
+/**
+ * gdk_attach_params_add_primary_rules_valist:
+ * @params: a #GdkAttachParams
+ * @first_rule: first primary rule
+ * @args: a #va_list of the remaining primary rules
+ *
+ * Non-variadic version of gdk_attach_params_add_primary_rules().
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_add_primary_rules_valist (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ va_list args)
+{
+ add_rules (params->primary_rules, first_rule, args);
+}
+
+/**
+ * gdk_attach_params_add_secondary_rules_valist:
+ * @params: a #GdkAttachParams
+ * @first_rule: first secondary rule
+ * @args: a #va_list of the remaining secondary rules
+ *
+ * Non-variadic version of gdk_attach_params_add_secondary_rules().
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_add_secondary_rules_valist (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ va_list args)
+{
+ add_rules (params->secondary_rules, first_rule, args);
+}
+
+/**
+ * gdk_attach_params_add_primary_rules:
+ * @params: a #GdkAttachParams
+ * @first_rule: first primary rule
+ * @...: a %NULL-terminated list of rules
+ *
+ * Appends to the list of primary positioning rules to try.
+ *
+ * A typical backend will try each primary rule in the order they're added. If
+ * a rule can be satisfied, it will then try each secondary rule until it
+ * finds a satisfiable secondary rule that doesn't conflict with the primary
+ * rule. If it finds a pair of satisfiable non-conflicting rules, then it will
+ * place the window there. If it cannot find a pair, it proceeds to the next
+ * primary rule and tries again.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_add_primary_rules (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ ...)
+{
+ va_list args;
+
+ g_return_if_fail (params);
+
+ va_start (args, first_rule);
+
+ gdk_attach_params_add_primary_rules_valist (params, first_rule, args);
+
+ va_end (args);
+}
+
+/**
+ * gdk_attach_params_add_secondary_rules:
+ * @params: a #GdkAttachParams
+ * @first_rule: first secondary rule
+ * @...: a %NULL-terminated list of rules
+ *
+ * Appends to the list of secondary positioning rules to try.
+ *
+ * A typical backend will try each primary rule in the order they're added. If
+ * a rule can be satisfied, it will then try each secondary rule until it
+ * finds a satisfiable secondary rule that doesn't conflict with the primary
+ * rule. If it finds a pair of satisfiable non-conflicting rules, then it will
+ * place the window there. If it cannot find a pair, it proceeds to the next
+ * primary rule and tries again.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_add_secondary_rules (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ ...)
+{
+ va_list args;
+
+ g_return_if_fail (params);
+
+ va_start (args, first_rule);
+
+ gdk_attach_params_add_secondary_rules_valist (params, first_rule, args);
+
+ va_end (args);
+}
+
+static void
+rules_foreach (GArray *array,
+ GFunc func,
+ gpointer user_data)
+{
+ gint i;
+
+ for (i = 0; i < array->len; i++)
+ func (&g_array_index (array, GdkAttachRule, i), user_data);
+}
+
+/**
+ * gdk_attach_params_primary_rules_foreach:
+ * @params: a #GdkAttachParams
+ * @func: the function to call with each primary rule
+ * @user_data: (nullable): user data to pass to the function
+ *
+ * Applies @func to each primary rule in @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_primary_rules_foreach (GdkAttachParams *params,
+ GFunc func,
+ gpointer user_data)
+{
+ g_return_if_fail (params);
+ g_return_if_fail (func);
+
+ rules_foreach (params->primary_rules, func, user_data);
+}
+
+/**
+ * gdk_attach_params_secondary_rules_foreach:
+ * @params: a #GdkAttachParams
+ * @func: the function to call with each secondary rule
+ * @user_data: (nullable): user data to pass to the function
+ *
+ * Applies @func to each secondary rule in @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_secondary_rules_foreach (GdkAttachParams *params,
+ GFunc func,
+ gpointer user_data)
+{
+ g_return_if_fail (params);
+ g_return_if_fail (func);
+
+ rules_foreach (params->secondary_rules, func, user_data);
+}
+
+/**
+ * gdk_attach_params_set_position_callback:
+ * @params: a #GdkAttachParams
+ * @callback: (nullable): a function to be called when the final position of
+ * the window is known
+ * @user_data: (transfer full) (nullable): additional data to pass to @callback
+ * @destroy_notify: (nullable): a function to release @user_data
+ *
+ * Sets the function to be called when the final position of the window is
+ * known.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_set_position_callback (GdkAttachParams *params,
+ GdkAttachCallback callback,
+ gpointer user_data,
+ GDestroyNotify destroy_notify)
+{
+ g_return_if_fail (params);
+
+ params->attach_callback = callback;
+
+ if (user_data != params->attach_user_data)
+ {
+ if (params->attach_user_data && params->attach_destroy_notify)
+ params->attach_destroy_notify (params->attach_user_data);
+
+ params->attach_user_data = user_data;
+ params->attach_destroy_notify = destroy_notify;
+ }
+ else if (user_data)
+ g_warning ("%s (): params already owns user data", G_STRFUNC);
+}
+
+static gboolean
+is_satisfiable (GdkAttachRule rule,
+ const GdkAttachParams *params,
+ gint width,
+ gint height,
+ const GdkRectangle *bounds,
+ gint *value)
+{
+ gboolean use_attach_margin;
+ gboolean use_window_padding;
+
+ g_return_val_if_fail (params, FALSE);
+ g_return_val_if_fail (params->has_attach_rect, FALSE);
+
+ use_attach_margin = (((rule & GDK_ATTACH_RECT_MASK) == GDK_ATTACH_RECT_MIN &&
+ (rule & GDK_ATTACH_WINDOW_MASK) == GDK_ATTACH_WINDOW_MAX) ||
+ ((rule & GDK_ATTACH_RECT_MASK) == GDK_ATTACH_RECT_MAX &&
+ (rule & GDK_ATTACH_WINDOW_MASK) == GDK_ATTACH_WINDOW_MIN));
+
+ use_window_padding = TRUE;
+
+ *value = 0;
+
+ switch (rule & GDK_ATTACH_AXIS_MASK)
+ {
+ case GDK_ATTACH_AXIS_X:
+ if (params->attach_parent)
+ gdk_window_get_origin (params->attach_parent, value, NULL);
+
+ switch (rule & GDK_ATTACH_RECT_MASK)
+ {
+ case GDK_ATTACH_RECT_MIN:
+ *value += params->attach_rect.x;
+
+ if (use_attach_margin)
+ *value -= params->attach_margin.left;
+
+ break;
+
+ case GDK_ATTACH_RECT_MID:
+ *value += params->attach_rect.x + params->attach_rect.width / 2;
+ break;
+
+ case GDK_ATTACH_RECT_MAX:
+ *value += params->attach_rect.x + params->attach_rect.width;
+
+ if (use_attach_margin)
+ *value += params->attach_margin.right;
+
+ break;
+ }
+
+ switch (rule & GDK_ATTACH_WINDOW_MASK)
+ {
+ case GDK_ATTACH_WINDOW_MIN:
+ if (use_window_padding)
+ *value -= params->window_padding.left;
+
+ break;
+
+ case GDK_ATTACH_WINDOW_MID:
+ *value -= width / 2;
+ break;
+
+ case GDK_ATTACH_WINDOW_MAX:
+ *value -= width;
+
+ if (use_window_padding)
+ *value += params->window_padding.right;
+
+ break;
+ }
+
+ *value += params->offset_x;
+
+ return !bounds || (bounds->x <= *value && *value + width <= bounds->x + bounds->width);
+
+ case GDK_ATTACH_AXIS_Y:
+ if (params->attach_parent)
+ gdk_window_get_origin (params->attach_parent, NULL, value);
+
+ switch (rule & GDK_ATTACH_RECT_MASK)
+ {
+ case GDK_ATTACH_RECT_MIN:
+ *value += params->attach_rect.y;
+
+ if (use_attach_margin)
+ *value -= params->attach_margin.top;
+
+ break;
+
+ case GDK_ATTACH_RECT_MID:
+ *value += params->attach_rect.y + params->attach_rect.height / 2;
+ break;
+
+ case GDK_ATTACH_RECT_MAX:
+ *value += params->attach_rect.y + params->attach_rect.height;
+
+ if (use_attach_margin)
+ *value += params->attach_margin.bottom;
+
+ break;
+ }
+
+ switch (rule & GDK_ATTACH_WINDOW_MASK)
+ {
+ case GDK_ATTACH_WINDOW_MIN:
+ if (use_window_padding)
+ *value -= params->window_padding.top;
+
+ break;
+
+ case GDK_ATTACH_WINDOW_MID:
+ *value -= height / 2;
+ break;
+
+ case GDK_ATTACH_WINDOW_MAX:
+ *value -= height;
+
+ if (use_window_padding)
+ *value += params->window_padding.bottom;
+
+ break;
+ }
+
+ *value += params->offset_y;
+
+ return !bounds || (bounds->y <= *value && *value + height <= bounds->y + bounds->height);
+ }
+
+ return FALSE;
+}
+
+#define BEST 0
+#define GOOD 1
+#define PRIMARY 0
+#define SECONDARY 1
+#define X 0
+#define Y 1
+
+/**
+ * gdk_attach_params_choose_position:
+ * @params: a #GdkAttachParams
+ * @width: window width
+ * @height: window height
+ * @bounds: (nullable): monitor geometry
+ * @x: (out) (optional): the best x-coordinate for the window
+ * @y: (out) (optional): the best y-coordinate for the window
+ * @offset_x: (out) (optional): the horizontal displacement needed to push the
+ * window on-screen
+ * @offset_y: (out) (optional): the vertical displacement needed to push the
+ * window on-screen
+ * @primary_rule: (out) (optional): the best primary rule
+ * @secondary_rule: (out) (optional): the best secondary rule
+ *
+ * Finds the best position for a window of size @width and @height on a screen
+ * with @bounds using the given @params.
+ *
+ * Returns: %TRUE if there is a pair of satisfiable primary and secondary
+ * rules that do not conflict with each other
+ *
+ * Since: 3.20
+ */
+gboolean
+gdk_attach_params_choose_position (const GdkAttachParams *params,
+ gint width,
+ gint height,
+ const GdkRectangle *bounds,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ GdkAttachRule *primary_rule,
+ GdkAttachRule *secondary_rule)
+{
+ gint tmp_x;
+ gint tmp_y;
+ gint tmp_offset_x;
+ gint tmp_offset_y;
+ GdkAttachRule pr;
+ GdkAttachRule sr;
+ GdkAttachRule rules[2][2][2] = { 0 };
+ gint axes[2][2] = { 0 };
+ gint values[2][2][2] = { 0 };
+ GArray *arrays[2];
+ gint i;
+ gint j;
+ gint k;
+ GdkAttachRule rule;
+ gint axis;
+ gint value;
+ gboolean satisfiable;
+ gboolean success;
+
+ g_return_val_if_fail (params, FALSE);
+ g_return_val_if_fail (params->has_attach_rect, FALSE);
+
+ if (!x)
+ x = &tmp_x;
+
+ if (!y)
+ y = &tmp_y;
+
+ if (!offset_x)
+ offset_x = &tmp_offset_x;
+
+ if (!offset_y)
+ offset_y = &tmp_offset_y;
+
+ if (!primary_rule)
+ primary_rule = ≺
+
+ if (!secondary_rule)
+ secondary_rule = &sr;
+
+ arrays[PRIMARY] = params->primary_rules;
+ arrays[SECONDARY] = params->secondary_rules;
+
+ for (i = PRIMARY; i <= SECONDARY; i++)
+ {
+ for (j = 0; j < arrays[i]->len; j++)
+ {
+ rule = g_array_index (arrays[i], GdkAttachRule, j);
+
+ switch (rule & GDK_ATTACH_AXIS_MASK)
+ {
+ case GDK_ATTACH_AXIS_X:
+ axis = X;
+ break;
+
+ case GDK_ATTACH_AXIS_Y:
+ axis = Y;
+ break;
+
+ default:
+ axis = -1;
+ break;
+ }
+
+ if (axis < 0)
+ {
+ g_warning ("%s (): invalid constraint axis: 0x%X", G_STRFUNC, rule);
+ continue;
+ }
+
+ satisfiable = is_satisfiable (rule, params, width, height, bounds, &value);
+
+ if (satisfiable && !rules[i][BEST][axis])
+ {
+ rules[i][BEST][axis] = rule;
+ values[i][BEST][axis] = value;
+
+ if (rules[i][BEST][!axis])
+ break;
+ else
+ axes[i][BEST] = axis;
+ }
+ else if (!rules[i][GOOD][axis])
+ {
+ rules[i][GOOD][axis] = rule;
+ values[i][GOOD][axis] = value;
+
+ if (!rules[i][GOOD][!axis])
+ axes[i][GOOD] = axis;
+ }
+ }
+ }
+
+ success = FALSE;
+
+ for (i = BEST; i <= GOOD; i++)
+ {
+ for (j = BEST; j <= GOOD; j++)
+ {
+ for (k = Y; k >= X; k--)
+ {
+ if (rules[PRIMARY][i][axes[PRIMARY][i] == k] && rules[SECONDARY][j][axes[PRIMARY][i] != k])
+ {
+ *primary_rule = rules[PRIMARY][i][axes[PRIMARY][i] == k];
+ *secondary_rule = rules[SECONDARY][j][axes[PRIMARY][i] != k];
+
+ if ((axes[PRIMARY][i] == k) == X)
+ {
+ *x = values[PRIMARY][i][X];
+ *y = values[SECONDARY][j][Y];
+ }
+ else
+ {
+ *x = values[SECONDARY][j][X];
+ *y = values[PRIMARY][i][Y];
+ }
+
+ *offset_x = 0;
+ *offset_y = 0;
+ success = TRUE;
+ break;
+ }
+ }
+
+ if (success)
+ break;
+ }
+
+ if (success)
+ break;
+ }
+
+ if (success && bounds)
+ {
+ if (*x + width > bounds->x + bounds->width)
+ {
+ *offset_x += bounds->x + bounds->width - width - *x;
+ *x = bounds->x + bounds->width - width;
+ }
+
+ if (*x < bounds->x)
+ {
+ *offset_x += bounds->x - *x;
+ *x = bounds->x;
+ }
+
+ if (*y + height > bounds->y + bounds->height)
+ {
+ *offset_y += bounds->y + bounds->height - height - *y;
+ *y = bounds->y + bounds->height - height;
+ }
+
+ if (*y < bounds->y)
+ {
+ *offset_y += bounds->y - *y;
+ *y = bounds->y;
+ }
+ }
+
+ return success;
+}
+
+/**
+ * gdk_attach_params_choose_position_for_window:
+ * @params: a #GdkAttachParams
+ * @window: (transfer none) (not nullable): the #GdkWindow to find the best
+ * position for
+ * @x: (out) (optional): the best x-coordinate for the window
+ * @y: (out) (optional): the best y-coordinate for the window
+ * @offset_x: (out) (optional): the horizontal displacement needed to push the
+ * window on-screen
+ * @offset_y: (out) (optional): the vertical displacement needed to push the
+ * window on-screen
+ * @primary_rule: (out) (optional): the best primary rule
+ * @secondary_rule: (out) (optional): the best secondary rule
+ *
+ * Finds the best position for @window according to @params.
+ *
+ * Returns: %TRUE if there's a best position
+ *
+ * Since: 3.20
+ */
+gboolean
+gdk_attach_params_choose_position_for_window (const GdkAttachParams *params,
+ GdkWindow *window,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ GdkAttachRule *primary_rule,
+ GdkAttachRule *secondary_rule)
+{
+ GdkScreen *screen;
+ gint origin_x;
+ gint origin_y;
+ gint center_x;
+ gint center_y;
+ gint monitor;
+ GdkRectangle bounds;
+ gint width;
+ gint height;
+
+ g_return_val_if_fail (params, FALSE);
+ g_return_val_if_fail (params->has_attach_rect, FALSE);
+ g_return_val_if_fail (window, FALSE);
+
+ screen = gdk_window_get_screen (window);
+ gdk_window_get_origin (window, &origin_x, &origin_y);
+ center_x = origin_x + params->attach_rect.x + params->attach_rect.width / 2;
+ center_y = origin_y + params->attach_rect.y + params->attach_rect.height / 2;
+ monitor = gdk_screen_get_monitor_at_point (screen, center_x, center_y);
+ gdk_screen_get_monitor_workarea (screen, monitor, &bounds);
+ width = gdk_window_get_width (window);
+ height = gdk_window_get_height (window);
+
+ return gdk_attach_params_choose_position (params,
+ width,
+ height,
+ &bounds,
+ x,
+ y,
+ offset_x,
+ offset_y,
+ primary_rule,
+ secondary_rule);
+}
+
+/**
+ * gdk_attach_params_move_window:
+ * @params: a #GdkAttachParams
+ * @window: (transfer none) (not nullable): the #GdkWindow to position
+ *
+ * Moves @window to the best position according to @params.
+ *
+ * Since: 3.20
+ */
+void
+gdk_attach_params_move_window (const GdkAttachParams *params,
+ GdkWindow *window)
+{
+ gint x;
+ gint y;
+ gint offset_x;
+ gint offset_y;
+ GdkAttachRule primary_rule;
+ GdkAttachRule secondary_rule;
+
+ g_return_if_fail (GDK_IS_WINDOW (window));
+
+ if (!params || !params->has_attach_rect)
+ return;
+
+ if (gdk_attach_params_choose_position_for_window (params,
+ window,
+ &x,
+ &y,
+ &offset_x,
+ &offset_y,
+ &primary_rule,
+ &secondary_rule))
+ {
+ gdk_window_move (window, x, y);
+
+ if (params->attach_callback)
+ params->attach_callback (window,
+ params,
+ x,
+ y,
+ offset_x,
+ offset_y,
+ primary_rule,
+ secondary_rule,
+ params->attach_user_data);
+ }
+}
diff --git a/gdk/gdkattachparams.h b/gdk/gdkattachparams.h
new file mode 100644
index 0000000..cc30c60
--- /dev/null
+++ b/gdk/gdkattachparams.h
@@ -0,0 +1,153 @@
+#ifndef __GDK_ATTACH_PARAMS_H__
+#define __GDK_ATTACH_PARAMS_H__
+
+#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
+#error "Only <gdk/gdk.h> can be included directly."
+#endif
+
+#include <gdk/gdktypes.h>
+#include <gdk/gdkversionmacros.h>
+
+G_BEGIN_DECLS
+
+/**
+ * GdkAttachRule:
+ * @GDK_ATTACH_UNKNOWN: not a constraint
+ * @GDK_ATTACH_AXIS_X: constrain horizontally
+ * @GDK_ATTACH_AXIS_Y: constrain vertically
+ * @GDK_ATTACH_AXIS_MASK: mask for constraint axis
+ * @GDK_ATTACH_RECT_MIN: left/top edge of rectangle
+ * @GDK_ATTACH_RECT_MID: center of rectangle
+ * @GDK_ATTACH_RECT_MAX: right/bottom edge of rectangle
+ * @GDK_ATTACH_RECT_MASK: mask for rectangle anchor
+ * @GDK_ATTACH_WINDOW_MIN: left/top edge of window
+ * @GDK_ATTACH_WINDOW_MID: center of window
+ * @GDK_ATTACH_WINDOW_MAX: right/bottom edge of window
+ * @GDK_ATTACH_WINDOW_MASK: mask for window anchor
+ *
+ * Constraints on the position of the window relative to its attachment
+ * rectangle.
+ *
+ * 
+ *
+ * Since: 3.20
+ */
+typedef enum _GdkAttachRule
+{
+ GDK_ATTACH_UNKNOWN = 0,
+ GDK_ATTACH_AXIS_X = 1 << 0,
+ GDK_ATTACH_AXIS_Y = 1 << 1,
+ GDK_ATTACH_AXIS_MASK = GDK_ATTACH_AXIS_X | GDK_ATTACH_AXIS_Y,
+ GDK_ATTACH_RECT_MIN = 1 << 2,
+ GDK_ATTACH_RECT_MID = 2 << 2,
+ GDK_ATTACH_RECT_MAX = 3 << 2,
+ GDK_ATTACH_RECT_MASK = GDK_ATTACH_RECT_MIN | GDK_ATTACH_RECT_MID | GDK_ATTACH_RECT_MAX,
+ GDK_ATTACH_WINDOW_MIN = 1 << 4,
+ GDK_ATTACH_WINDOW_MID = 2 << 4,
+ GDK_ATTACH_WINDOW_MAX = 3 << 4,
+ GDK_ATTACH_WINDOW_MASK = GDK_ATTACH_WINDOW_MIN | GDK_ATTACH_WINDOW_MID | GDK_ATTACH_WINDOW_MAX
+} GdkAttachRule;
+
+/**
+ * GdkAttachParams:
+ *
+ * Opaque type containing the information needed to position a window relative
+ * to an attachment rectangle.
+ *
+ * Since: 3.20
+ */
+typedef struct _GdkAttachParams GdkAttachParams;
+
+/**
+ * GdkAttachCallback:
+ * @window: the #GdkWindow that was moved
+ * @params: (transfer none) (nullable): the #GdkAttachParams that was used
+ * @x: the final x-coordinate of @window
+ * @y: the final y-coordinate of @window
+ * @offset_x: the horizontal displacement applied to keep @window on-screen
+ * @offset_y: the vertical displacement applied to keep @window on-screen
+ * @primary_rule: the primary rule that was used for positioning. If unknown,
+ * this will be %GDK_ATTACH_UNKNOWN
+ * @secondary_rule: the secondary rule that was used for positioning. If
+ * unknown, this will be %GDK_ATTACH_UNKNOWN
+ * @user_data: (transfer none) (nullable): the user data that was set on
+ * @params
+ *
+ * A function that can be used to receive information about the final position
+ * of a window.
+ *
+ * Since: 3.20
+ */
+typedef void (*GdkAttachCallback) (GdkWindow *window,
+ const GdkAttachParams *params,
+ gint x,
+ gint y,
+ gint offset_x,
+ gint offset_y,
+ GdkAttachRule primary_rule,
+ GdkAttachRule secondary_rule,
+ gpointer user_data);
+
+GDK_AVAILABLE_IN_3_20
+GdkAttachParams * gdk_attach_params_new (void);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_free (gpointer data);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_attach_rect (GdkAttachParams *params,
+ const GdkRectangle *rectangle,
+ GdkWindow *parent);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_attach_margin (GdkAttachParams *params,
+ const GdkBorder *margin);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_window_padding (GdkAttachParams *params,
+ const GdkBorder *padding);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_window_offset (GdkAttachParams *params,
+ gint x,
+ gint y);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_add_primary_rules_valist (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ va_list args);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_add_secondary_rules_valist (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ va_list args);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_add_primary_rules (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ ...) G_GNUC_NULL_TERMINATED;
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_add_secondary_rules (GdkAttachParams *params,
+ GdkAttachRule first_rule,
+ ...) G_GNUC_NULL_TERMINATED;
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_primary_rules_foreach (GdkAttachParams *params,
+ GFunc func,
+ gpointer user_data);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_secondary_rules_foreach (GdkAttachParams *params,
+ GFunc func,
+ gpointer user_data);
+
+GDK_AVAILABLE_IN_3_20
+void gdk_attach_params_set_position_callback (GdkAttachParams *params,
+ GdkAttachCallback callback,
+ gpointer user_data,
+ GDestroyNotify destroy_notify);
+
+G_END_DECLS
+
+#endif /* __GDK_ATTACH_PARAMS_H__ */
diff --git a/gdk/gdkattachparamsprivate.h b/gdk/gdkattachparamsprivate.h
new file mode 100644
index 0000000..1ccf45d
--- /dev/null
+++ b/gdk/gdkattachparamsprivate.h
@@ -0,0 +1,75 @@
+#ifndef __GDK_ATTACH_PARAMS_PRIVATE_H__
+#define __GDK_ATTACH_PARAMS_PRIVATE_H__
+
+#include "gdkattachparams.h"
+
+G_BEGIN_DECLS
+
+/*
+ * GdkAttachParams:
+ * @has_attach_rect: %TRUE if @attach_rect is valid
+ * @attach_rect: the attachment rectangle to attach the window to
+ * @attach_parent: the #GdkWindow that @attach_rect is relative to
+ * @attach_margin: the space to leave around @attach_rect
+ * @window_padding: the space between the window and its contents
+ * @offset_x: the horizontal offset to displace the window by
+ * @offset_y: the vertical offset to displace the window by
+ * @primary_rules: an array of primary #GdkAttachRule
+ * @secondary_rules: an array of secondary #GdkAttachRule
+ * @position_callback: a function to call when the final position is known
+ * @position_callback_user_data: additional data to pass to @position_callback
+ * @position_callback_destroy_notify: a function to free
+ * @position_callback_user_data
+ *
+ * Opaque type containing the information needed to position a window relative
+ * to an attachment rectangle.
+ *
+ * Since: 3.20
+ */
+struct _GdkAttachParams
+{
+ /*< private >*/
+ gboolean has_attach_rect;
+ GdkRectangle attach_rect;
+ GdkWindow *attach_parent;
+
+ GdkBorder attach_margin;
+ GdkBorder window_padding;
+
+ gint offset_x;
+ gint offset_y;
+
+ GArray *primary_rules;
+ GArray *secondary_rules;
+
+ GdkAttachCallback attach_callback;
+ gpointer attach_user_data;
+ GDestroyNotify attach_destroy_notify;
+};
+
+gboolean gdk_attach_params_choose_position (const GdkAttachParams *params,
+ gint width,
+ gint height,
+ const GdkRectangle *bounds,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ GdkAttachRule *primary_rule,
+ GdkAttachRule *secondary_rule);
+
+gboolean gdk_attach_params_choose_position_for_window (const GdkAttachParams *params,
+ GdkWindow *window,
+ gint *x,
+ gint *y,
+ gint *offset_x,
+ gint *offset_y,
+ GdkAttachRule *primary_rule,
+ GdkAttachRule *secondary_rule);
+
+void gdk_attach_params_move_window (const GdkAttachParams *params,
+ GdkWindow *window);
+
+G_END_DECLS
+
+#endif /* __GDK_ATTACH_PARAMS_PRIVATE_H__ */
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