501 lines
12 KiB
C++
501 lines
12 KiB
C++
/*
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Copyright (C) 2016 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <gdkmm/cursor.h>
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#include "gtkmm2ext/pane.h"
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#include "i18n.h"
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using namespace PBD;
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using namespace Gtk;
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using namespace Gtkmm2ext;
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using namespace std;
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Pane::Pane (bool h)
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: horizontal (h)
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, did_move (false)
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, divider_width (2)
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{
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using namespace Gdk;
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set_name ("Pane");
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set_has_window (false);
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if (horizontal) {
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drag_cursor = Cursor (SB_H_DOUBLE_ARROW);
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} else {
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drag_cursor = Cursor (SB_V_DOUBLE_ARROW);
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}
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}
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void
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Pane::set_child_minsize (Gtk::Widget const& w, int32_t minsize)
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{
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for (Children::iterator c = children.begin(); c != children.end(); ++c) {
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if (c->w == &w) {
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c->minsize = minsize;
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break;
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}
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}
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}
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void
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Pane::set_drag_cursor (Gdk::Cursor c)
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{
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drag_cursor = c;
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}
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void
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Pane::on_size_request (GtkRequisition* req)
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{
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GtkRequisition largest;
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/* iterate over all children, get their size requests */
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/* horizontal pane is as high as its tallest child, including the dividers.
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* Its width is the sum of the children plus the dividers.
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*
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* vertical pane is as wide as its widest child, including the dividers.
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* Its height is the sum of the children plus the dividers.
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*/
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if (horizontal) {
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largest.width = (children.size() - 1) * divider_width;
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largest.height = 0;
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} else {
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largest.height = (children.size() - 1) * divider_width;
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largest.width = 0;
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}
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for (Children::iterator child = children.begin(); child != children.end(); ++child) {
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GtkRequisition r;
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child->w->size_request (r);
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if (horizontal) {
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largest.height = max (largest.height, r.height);
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largest.width += r.width;
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} else {
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largest.width = max (largest.width, r.width);
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largest.height += r.height;
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}
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}
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*req = largest;
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}
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GType
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Pane::child_type_vfunc() const
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{
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/* We accept any number of any types of widgets */
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return Gtk::Widget::get_type();
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}
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void
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Pane::add_divider ()
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{
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Divider* d = new Divider;
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d->signal_button_press_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_press_event), d), false);
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d->signal_button_release_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_release_event), d), false);
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d->signal_motion_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_motion_event), d), false);
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d->signal_enter_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_enter_event), d), false);
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d->signal_leave_notify_event().connect (sigc::bind (sigc::mem_fun (*this, &Pane::handle_leave_event), d), false);
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d->set_parent (*this);
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d->show ();
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d->fract = 0.5;
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dividers.push_back (d);
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}
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void
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Pane::handle_child_visibility ()
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{
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reallocate (get_allocation());
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}
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void
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Pane::on_add (Widget* w)
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{
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children.push_back (Child (w, 0));
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w->set_parent (*this);
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w->signal_show().connect (sigc::mem_fun (*this, &Pane::handle_child_visibility));
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w->signal_hide().connect (sigc::mem_fun (*this, &Pane::handle_child_visibility));
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while (dividers.size() < (children.size() - 1)) {
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add_divider ();
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}
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}
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void
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Pane::on_remove (Widget* w)
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{
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for (Children::iterator c = children.begin(); c != children.end(); ++c) {
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if (c->w == w) {
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children.erase (c);
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break;
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}
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}
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w->unparent ();
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}
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void
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Pane::on_size_allocate (Gtk::Allocation& alloc)
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{
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reallocate (alloc);
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Container::on_size_allocate (alloc);
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}
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void
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Pane::reallocate (Gtk::Allocation const & alloc)
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{
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int remaining;
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int xpos = alloc.get_x();
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int ypos = alloc.get_y();
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float fract;
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if (children.empty()) {
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return;
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}
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if (children.size() == 1) {
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/* only child gets the full allocation */
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children.front().w->size_allocate (alloc);
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return;
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}
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if (horizontal) {
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remaining = alloc.get_width ();
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} else {
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remaining = alloc.get_height ();
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}
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Children::iterator child;
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Children::iterator next;
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Dividers::iterator div;
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child = children.begin();
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/* skip initial hidden children */
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while (child != children.end()) {
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if (child->w->is_visible()) {
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break;
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}
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++child;
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}
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for (div = dividers.begin(); child != children.end(); ) {
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Gtk::Allocation child_alloc;
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next = child;
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/* Move on to next *visible* child */
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while (++next != children.end()) {
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if (next->w->is_visible()) {
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break;
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}
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}
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child_alloc.set_x (xpos);
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child_alloc.set_y (ypos);
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if (next == children.end()) {
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/* last child gets all the remaining space */
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fract = 1.0;
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} else {
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/* child gets the fraction of the remaining space given by the divider that follows it */
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fract = (*div)->fract;
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}
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Gtk::Requisition cr;
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child->w->size_request (cr);
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if (horizontal) {
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child_alloc.set_width ((gint) floor (remaining * fract));
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child_alloc.set_height (alloc.get_height());
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remaining = max (0, (remaining - child_alloc.get_width()));
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xpos += child_alloc.get_width();
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} else {
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child_alloc.set_width (alloc.get_width());
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child_alloc.set_height ((gint) floor (remaining * fract));
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remaining = max (0, (remaining - child_alloc.get_height()));
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ypos += child_alloc.get_height ();
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}
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if (child->minsize) {
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if (horizontal) {
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child_alloc.set_width (max (child_alloc.get_width(), child->minsize));
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} else {
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child_alloc.set_height (max (child_alloc.get_height(), child->minsize));
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}
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}
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child->w->size_allocate (child_alloc);
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if (next == children.end()) {
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/* done, no more children, no need for a divider */
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break;
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}
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child = next;
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/* add a divider between children */
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Gtk::Allocation divider_allocation;
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divider_allocation.set_x (xpos);
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divider_allocation.set_y (ypos);
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if (horizontal) {
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divider_allocation.set_width (divider_width);
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divider_allocation.set_height (alloc.get_height());
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remaining = max (0, remaining - divider_width);
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xpos += divider_width;
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} else {
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divider_allocation.set_width (alloc.get_width());
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divider_allocation.set_height (divider_width);
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remaining = max (0, remaining - divider_width);
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ypos += divider_width;
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}
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(*div)->size_allocate (divider_allocation);
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(*div)->show ();
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++div;
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}
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/* hide all remaining dividers */
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while (div != dividers.end()) {
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(*div)->hide ();
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++div;
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}
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}
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bool
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Pane::on_expose_event (GdkEventExpose* ev)
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{
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Children::iterator child;
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Dividers::iterator div;
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for (child = children.begin(), div = dividers.begin(); child != children.end(); ++child, ++div) {
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if (child->w->is_visible()) {
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propagate_expose (*(child->w), ev);
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}
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if ((div != dividers.end()) && (*div)->is_visible()) {
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propagate_expose (**div, ev);
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}
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}
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return true;
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}
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bool
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Pane::handle_press_event (GdkEventButton* ev, Divider* d)
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{
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d->dragging = true;
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d->queue_draw ();
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return false;
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}
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bool
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Pane::handle_release_event (GdkEventButton* ev, Divider* d)
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{
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d->dragging = false;
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if (did_move) {
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children.front().w->queue_resize ();
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did_move = false;
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}
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return false;
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}
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bool
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Pane::handle_motion_event (GdkEventMotion* ev, Divider* d)
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{
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did_move = true;
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if (!d->dragging) {
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return true;
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}
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/* determine new position for handle */
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float new_fract;
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int px, py;
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d->translate_coordinates (*this, ev->x, ev->y, px, py);
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Dividers::iterator prev = dividers.end();
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for (Dividers::iterator di = dividers.begin(); di != dividers.end(); ++di) {
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if (*di == d) {
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break;
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}
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prev = di;
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}
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int space_remaining;
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int prev_edge;
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if (horizontal) {
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if (prev != dividers.end()) {
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prev_edge = (*prev)->get_allocation().get_x() + (*prev)->get_allocation().get_width();
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} else {
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prev_edge = 0;
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}
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space_remaining = get_allocation().get_width() - prev_edge;
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new_fract = (float) (px - prev_edge) / space_remaining;
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} else {
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if (prev != dividers.end()) {
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prev_edge = (*prev)->get_allocation().get_y() + (*prev)->get_allocation().get_height();
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} else {
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prev_edge = 0;
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}
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space_remaining = get_allocation().get_height() - prev_edge;
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new_fract = (float) (py - prev_edge) / space_remaining;
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}
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new_fract = min (1.0f, max (0.0f, new_fract));
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if (new_fract != d->fract) {
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d->fract = new_fract;
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reallocate (get_allocation ());
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queue_draw ();
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}
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return true;
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}
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void
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Pane::set_divider (Dividers::size_type div, float fract)
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{
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Dividers::iterator d = dividers.begin();
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while (div--) {
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++d;
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if (d == dividers.end()) {
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/* caller is trying to set divider that does not exist
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* yet.
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*/
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return;
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}
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}
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fract = max (0.0f, min (1.0f, fract));
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if (fract != (*d)->fract) {
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(*d)->fract = fract;
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/* our size hasn't changed, but our internal allocations have */
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reallocate (get_allocation());
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queue_draw ();
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}
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}
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float
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Pane::get_divider (Dividers::size_type div)
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{
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Dividers::iterator d = dividers.begin();
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while (div--) {
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++d;
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if (d == dividers.end()) {
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/* caller is trying to set divider that does not exist
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* yet.
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*/
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return -1.0f;
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}
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}
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return (*d)->fract;
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}
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void
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Pane::forall_vfunc (gboolean include_internals, GtkCallback callback, gpointer callback_data)
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{
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/* since the callback could modify the child list(s), make sure we keep
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* the iterators safe;
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*/
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for (Children::iterator c = children.begin(); c != children.end(); ) {
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Children::iterator next = c;
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++next;
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callback (c->w->gobj(), callback_data);
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c = next;
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}
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if (include_internals) {
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for (Dividers::iterator d = dividers.begin(); d != dividers.end(); ) {
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Dividers::iterator next = d;
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++next;
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callback (GTK_WIDGET((*d)->gobj()), callback_data);
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d = next;
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}
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}
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}
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Pane::Divider::Divider ()
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: fract (0.0)
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, dragging (false)
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{
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set_events (Gdk::EventMask (Gdk::BUTTON_PRESS|
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Gdk::BUTTON_RELEASE|
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Gdk::MOTION_NOTIFY|
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Gdk::ENTER_NOTIFY|
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Gdk::LEAVE_NOTIFY));
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}
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bool
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Pane::Divider::on_expose_event (GdkEventExpose* ev)
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{
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Gdk::Color c = (dragging ? get_style()->get_fg (Gtk::STATE_ACTIVE) :
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get_style()->get_fg (get_state()));
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Cairo::RefPtr<Cairo::Context> draw_context = get_window()->create_cairo_context ();
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draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
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draw_context->clip_preserve ();
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draw_context->set_source_rgba (c.get_red_p(), c.get_green_p(), c.get_blue_p(), 1.0);
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draw_context->fill ();
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return true;
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}
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bool
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Pane::handle_enter_event (GdkEventCrossing*, Divider* d)
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{
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d->get_window()->set_cursor (drag_cursor);
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d->set_state (Gtk::STATE_SELECTED);
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return true;
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}
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bool
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Pane::handle_leave_event (GdkEventCrossing*, Divider* d)
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{
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d->get_window()->set_cursor ();
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d->set_state (Gtk::STATE_NORMAL);
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return true;
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}
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