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livetrax/libs/gtkmm2ext/pane.cc

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/*
Copyright (C) 2016 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <assert.h>
#include <gdkmm/cursor.h>
#include "gtkmm2ext/pane.h"
#include "pbd/i18n.h"
using namespace PBD;
using namespace Gtk;
using namespace Gtkmm2ext;
using namespace std;
Pane::Pane (bool h)
: horizontal (h)
, did_move (false)
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, divider_width (2)
, check_fract (false)
{
using namespace Gdk;
set_name ("Pane");
set_has_window (false);
if (horizontal) {
drag_cursor = Cursor (SB_H_DOUBLE_ARROW);
} else {
drag_cursor = Cursor (SB_V_DOUBLE_ARROW);
}
}
Pane::~Pane ()
{
for (Children::iterator c = children.begin(); c != children.end(); ++c) {
c->show_con.disconnect ();
c->hide_con.disconnect ();
c->w->remove_destroy_notify_callback (&(*c));
c->w->unparent ();
}
}
void
Pane::set_child_minsize (Gtk::Widget const& w, int32_t minsize)
{
for (Children::iterator c = children.begin(); c != children.end(); ++c) {
if (c->w == &w) {
c->minsize = minsize;
break;
}
}
}
void
Pane::set_drag_cursor (Gdk::Cursor c)
{
drag_cursor = c;
}
void
Pane::on_size_request (GtkRequisition* req)
{
GtkRequisition largest;
/* iterate over all children, get their size requests */
/* horizontal pane is as high as its tallest child, including the dividers.
* Its width is the sum of the children plus the dividers.
*
* vertical pane is as wide as its widest child, including the dividers.
* Its height is the sum of the children plus the dividers.
*/
if (horizontal) {
largest.width = (children.size() - 1) * divider_width;
largest.height = 0;
} else {
largest.height = (children.size() - 1) * divider_width;
largest.width = 0;
}
for (Children::iterator child = children.begin(); child != children.end(); ++child) {
GtkRequisition r;
if (!child->w->is_visible ()) {
continue;
}
child->w->size_request (r);
if (horizontal) {
largest.height = max (largest.height, r.height);
if (child->minsize) {
largest.width += child->minsize;
} else {
largest.width += r.width;
}
} else {
largest.width = max (largest.width, r.width);
if (child->minsize) {
largest.height += child->minsize;
} else {
largest.height += r.height;
}
}
}
*req = largest;
}
GType
Pane::child_type_vfunc() const
{
/* We accept any number of any types of widgets */
return Gtk::Widget::get_type();
}
void
Pane::add_divider ()
{
Divider* d = new Divider;
d->set_name (X_("Divider"));
d->signal_button_press_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_press_event), d), false);
d->signal_button_release_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_release_event), d), false);
d->signal_motion_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_motion_event), d), false);
d->signal_enter_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_enter_event), d), false);
d->signal_leave_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_leave_event), d), false);
d->set_parent (*this);
d->show ();
d->fract = 0.5;
dividers.push_back (d);
}
void
Pane::handle_child_visibility ()
{
reallocate (get_allocation());
}
void
Pane::on_add (Widget* w)
{
children.push_back (Child (this, w, 0));
Child& kid = children.back ();
w->set_parent (*this);
/* Gtkmm 2.4 does not correctly arrange for ::on_remove() to be called
for custom containers that derive from Gtk::Container. So ... we need
to ensure that we hear about child destruction ourselves.
*/
w->add_destroy_notify_callback (&children.back(), &Pane::notify_child_destroyed);
kid.show_con = w->signal_show().connect (sigc::mem_fun (*this, &Pane::handle_child_visibility));
kid.hide_con = w->signal_hide().connect (sigc::mem_fun (*this, &Pane::handle_child_visibility));
while (dividers.size() < (children.size() - 1)) {
add_divider ();
}
}
void*
Pane::notify_child_destroyed (void* data)
{
Child* child = reinterpret_cast<Child*> (data);
return child->pane->child_destroyed (child->w);
}
void*
Pane::child_destroyed (Gtk::Widget* w)
{
for (Children::iterator c = children.begin(); c != children.end(); ++c) {
if (c->w == w) {
c->show_con.disconnect ();
c->hide_con.disconnect ();
children.erase (c);
break;
}
}
return 0;
}
void
Pane::on_remove (Widget* w)
{
for (Children::iterator c = children.begin(); c != children.end(); ++c) {
if (c->w == w) {
c->show_con.disconnect ();
c->hide_con.disconnect ();
w->remove_destroy_notify_callback (&(*c));
w->unparent ();
children.erase (c);
break;
}
}
}
void
Pane::on_size_allocate (Gtk::Allocation& alloc)
{
reallocate (alloc);
Container::on_size_allocate (alloc);
/* minumum pane size constraints */
Dividers::size_type div = 0;
for (Dividers::const_iterator d = dividers.begin(); d != dividers.end(); ++d, ++div) {
Pane::set_divider (div, (*d)->fract);
}
// TODO this needs tweaking for panes with > 2 children
// if a child grows, re-check the ones before it.
assert (dividers.size () < 3);
}
void
Pane::reallocate (Gtk::Allocation const & alloc)
{
int remaining;
int xpos = alloc.get_x();
int ypos = alloc.get_y();
float fract;
if (children.empty()) {
return;
}
if (children.size() == 1) {
/* only child gets the full allocation */
children.front().w->size_allocate (alloc);
return;
}
if (horizontal) {
remaining = alloc.get_width ();
} else {
remaining = alloc.get_height ();
}
Children::iterator child;
Children::iterator next;
Dividers::iterator div;
child = children.begin();
/* skip initial hidden children */
while (child != children.end()) {
if (child->w->is_visible()) {
break;
}
++child;
}
for (div = dividers.begin(); child != children.end(); ) {
Gtk::Allocation child_alloc;
next = child;
/* Move on to next *visible* child */
while (++next != children.end()) {
if (next->w->is_visible()) {
break;
}
}
child_alloc.set_x (xpos);
child_alloc.set_y (ypos);
if (next == children.end()) {
/* last child gets all the remaining space */
fract = 1.0;
} else {
/* child gets the fraction of the remaining space given by the divider that follows it */
fract = (*div)->fract;
}
Gtk::Requisition cr;
child->w->size_request (cr);
if (horizontal) {
child_alloc.set_width ((gint) floor (remaining * fract));
child_alloc.set_height (alloc.get_height());
remaining = max (0, (remaining - child_alloc.get_width()));
xpos += child_alloc.get_width();
} else {
child_alloc.set_width (alloc.get_width());
child_alloc.set_height ((gint) floor (remaining * fract));
remaining = max (0, (remaining - child_alloc.get_height()));
ypos += child_alloc.get_height ();
}
if (child->minsize) {
if (horizontal) {
child_alloc.set_width (max (child_alloc.get_width(), child->minsize));
} else {
child_alloc.set_height (max (child_alloc.get_height(), child->minsize));
}
}
child->w->size_allocate (child_alloc);
if (next == children.end()) {
/* done, no more children, no need for a divider */
break;
}
child = next;
/* add a divider between children */
Gtk::Allocation divider_allocation;
divider_allocation.set_x (xpos);
divider_allocation.set_y (ypos);
if (horizontal) {
divider_allocation.set_width (divider_width);
divider_allocation.set_height (alloc.get_height());
remaining = max (0, remaining - divider_width);
xpos += divider_width;
} else {
divider_allocation.set_width (alloc.get_width());
divider_allocation.set_height (divider_width);
remaining = max (0, remaining - divider_width);
ypos += divider_width;
}
(*div)->size_allocate (divider_allocation);
(*div)->show ();
++div;
}
/* hide all remaining dividers */
while (div != dividers.end()) {
(*div)->hide ();
++div;
}
}
bool
Pane::on_expose_event (GdkEventExpose* ev)
{
Children::iterator child;
Dividers::iterator div;
for (child = children.begin(), div = dividers.begin(); child != children.end(); ++child) {
if (child->w->is_visible()) {
propagate_expose (*(child->w), ev);
}
if (div != dividers.end()) {
if ((*div)->is_visible()) {
propagate_expose (**div, ev);
}
++div;
}
}
return true;
}
bool
Pane::handle_press_event (GdkEventButton* ev, Divider* d)
{
d->dragging = true;
d->queue_draw ();
return false;
}
bool
Pane::handle_release_event (GdkEventButton* ev, Divider* d)
{
d->dragging = false;
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if (did_move && !children.empty()) {
children.front().w->queue_resize ();
did_move = false;
}
return false;
}
void
Pane::set_check_divider_position (bool yn)
{
check_fract = yn;
}
float
Pane::constrain_fract (Dividers::size_type div, float fract)
{
if (get_allocation().get_width() == 1 && get_allocation().get_height() == 1) {
/* space not * allocated - * divider being set from startup code. Let it pass,
* since our goal is mostly to catch drags to a position that will interfere with window
* resizing.
*/
return fract;
}
const float size = horizontal ? get_allocation().get_width() : get_allocation().get_height();
// TODO: optimize: cache in Pane::on_size_request
Gtk::Requisition prev_req(children.at (div).w->size_request ());
Gtk::Requisition next_req(children.at (div + 1).w->size_request ());
float prev = divider_width + (horizontal ? prev_req.width : prev_req.height);
float next = divider_width + (horizontal ? next_req.width : next_req.height);
if (children.at (div).minsize) {
prev = children.at (div).minsize;
}
if (children.at (div + 1).minsize) {
next = children.at (div + 1).minsize;
}
if (size * fract < prev) {
return prev / size;
}
if (size * (1.f - fract) < next) {
return 1.f - next / size;
}
if (!check_fract) {
return fract;
}
#ifdef __APPLE__
/* On Quartz, if the pane handle (divider) gets to
be adjacent to the window edge, you can no longer grab it:
any attempt to do so is interpreted by the Quartz window
manager ("Finder") as a resize drag on the window edge.
*/
if (horizontal) {
if (div == dividers.size() - 1) {
if (get_allocation().get_width() * (1.0 - fract) < (divider_width*2)) {
/* too close to right edge */
return 1.f - (divider_width * 2.f) / (float) get_allocation().get_width();
}
}
if (div == 0) {
if (get_allocation().get_width() * fract < (divider_width*2)) {
/* too close to left edge */
return (divider_width * 2.f) / (float)get_allocation().get_width();
}
}
} else {
if (div == dividers.size() - 1) {
if (get_allocation().get_height() * (1.0 - fract) < (divider_width*2)) {
/* too close to bottom */
return 1.f - (divider_width * 2.f) / (float) get_allocation().get_height();
}
}
if (div == 0) {
if (get_allocation().get_height() * fract < (divider_width*2)) {
/* too close to top */
return (divider_width * 2.f) / (float) get_allocation().get_height();
}
}
}
#endif
return fract;
}
bool
Pane::handle_motion_event (GdkEventMotion* ev, Divider* d)
{
did_move = true;
if (!d->dragging) {
return true;
}
/* determine new position for handle */
float new_fract;
int px, py;
d->translate_coordinates (*this, ev->x, ev->y, px, py);
Dividers::iterator prev = dividers.end();
Dividers::size_type div = 0;
for (Dividers::iterator di = dividers.begin(); di != dividers.end(); ++di, ++div) {
if (*di == d) {
break;
}
prev = di;
}
int space_remaining;
int prev_edge;
if (horizontal) {
if (prev != dividers.end()) {
prev_edge = (*prev)->get_allocation().get_x() + (*prev)->get_allocation().get_width();
} else {
prev_edge = 0;
}
space_remaining = get_allocation().get_width() - prev_edge;
new_fract = (float) (px - prev_edge) / space_remaining;
} else {
if (prev != dividers.end()) {
prev_edge = (*prev)->get_allocation().get_y() + (*prev)->get_allocation().get_height();
} else {
prev_edge = 0;
}
space_remaining = get_allocation().get_height() - prev_edge;
new_fract = (float) (py - prev_edge) / space_remaining;
}
new_fract = min (1.0f, max (0.0f, new_fract));
new_fract = constrain_fract (div, new_fract);
if (new_fract != d->fract) {
d->fract = new_fract;
reallocate (get_allocation ());
queue_draw ();
}
return true;
}
void
Pane::set_divider (Dividers::size_type div, float fract)
{
Dividers::iterator d = dividers.begin();
for (d = dividers.begin(); d != dividers.end() && div != 0; ++d, --div) {
/* relax */
}
if (d == dividers.end()) {
/* caller is trying to set divider that does not exist
* yet.
*/
return;
}
fract = max (0.0f, min (1.0f, fract));
fract = constrain_fract (div, fract);
if (fract != (*d)->fract) {
(*d)->fract = fract;
/* our size hasn't changed, but our internal allocations have */
reallocate (get_allocation());
queue_draw ();
}
}
float
Pane::get_divider (Dividers::size_type div)
{
Dividers::iterator d = dividers.begin();
for (d = dividers.begin(); d != dividers.end() && div != 0; ++d, --div) {
/* relax */
}
if (d == dividers.end()) {
/* caller is trying to set divider that does not exist
* yet.
*/
return -1.0f;
}
return (*d)->fract;
}
void
Pane::forall_vfunc (gboolean include_internals, GtkCallback callback, gpointer callback_data)
{
/* since the callback could modify the child list(s), make sure we keep
* the iterators safe;
*/
for (Children::iterator c = children.begin(); c != children.end(); ) {
Children::iterator next = c;
++next;
callback (c->w->gobj(), callback_data);
c = next;
}
if (include_internals) {
for (Dividers::iterator d = dividers.begin(); d != dividers.end(); ) {
Dividers::iterator next = d;
++next;
callback (GTK_WIDGET((*d)->gobj()), callback_data);
d = next;
}
}
}
Pane::Divider::Divider ()
: fract (0.0)
, dragging (false)
{
set_events (Gdk::EventMask (Gdk::BUTTON_PRESS|
Gdk::BUTTON_RELEASE|
Gdk::MOTION_NOTIFY|
Gdk::ENTER_NOTIFY|
Gdk::LEAVE_NOTIFY));
}
bool
Pane::Divider::on_expose_event (GdkEventExpose* ev)
{
Gdk::Color c = (dragging ? get_style()->get_fg (Gtk::STATE_ACTIVE) :
get_style()->get_fg (get_state()));
Cairo::RefPtr<Cairo::Context> draw_context = get_window()->create_cairo_context ();
draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
draw_context->clip_preserve ();
draw_context->set_source_rgba (c.get_red_p(), c.get_green_p(), c.get_blue_p(), 1.0);
draw_context->fill ();
return true;
}
bool
Pane::handle_enter_event (GdkEventCrossing*, Divider* d)
{
d->get_window()->set_cursor (drag_cursor);
d->set_state (Gtk::STATE_SELECTED);
return true;
}
bool
Pane::handle_leave_event (GdkEventCrossing*, Divider* d)
{
d->get_window()->set_cursor ();
d->set_state (Gtk::STATE_NORMAL);
d->queue_draw ();
return true;
}