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- /*******************************************************************
- # Copyright 2014 Daniel 'grindhold' Brendle
- #
- # This file is part of Rainbow Lollipop.
- #
- # Rainbow Lollipop 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 3 of the License, or (at your option) any later
- # version.
- #
- # Rainbow Lollipop 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 Rainbow Lollipop.
- # If not, see http://www.gnu.org/licenses/.
- *********************************************************************/
- using Gee;
- using Math;
- namespace RainbowLollipop {
- /**
- * Converts the 8bit representation of a color into a float between 0.0 and 1.0
- */
- private float col_h2f(uchar col) {
- return col/255.0f;
- }
- /**
- * A Constraint that keeps an area aligned to
- * the source's right border and the target's left border.
- * Used to assign an area to NodeConnectors
- */
- public class ConnectorConstraint : Clutter.Constraint {
- private Clutter.Actor source;
- private Clutter.Actor target;
-
- /**
- * Create a new node Connector from source to target
- */
- public ConnectorConstraint(Clutter.Actor source, Clutter.Actor target) {
- this.source=source;
- this.target=target;
- }
- /**
- * Updates the area depending on source's and target's positions
- */
- public override void update_allocation(Clutter.Actor a, Clutter.ActorBox alloc) {
- var sourcebox = this.source.get_allocation_box();
- var targetbox = this.target.get_allocation_box();
- alloc.x1 = sourcebox.x2;
- alloc.y1 = sourcebox.y1+Config.c.node_height/2;
- alloc.x2 = targetbox.x1;
- alloc.y2 = targetbox.y1+Config.c.node_height/2+3;
- if (alloc.y2-alloc.y1 < (float)Config.c.connector_stroke) {
- alloc.y2 = alloc.y1+(float)Config.c.connector_stroke;
- }
- var bx = new Clutter.ActorBox();
- alloc.clamp_to_pixel(ref bx);
- (a.content as Clutter.Canvas).set_size((int)roundf(alloc.x2-alloc.x1), (int)roundf(alloc.y2-alloc.y1));
- }
- }
- /**
- * An Actor that draws a connecting line between two nodes.
- * You can configure the connectors thickness with the config-entry 'connector_stroke'
- */
- public class Connector : Clutter.Actor {
- private Clutter.Canvas c;
- private Node previous;
- private Node next;
- /**
- * Create a new Connector from the Node previous to the Node next
- */
- public Connector(Node previous, Node next) {
- this.previous = previous;
- this.next = next;
- this.c = new Clutter.Canvas();
- this.content = c;
- this.set_size(10,10);
- this.c.set_size(10,10);
- this.x = Config.c.node_height/2+Config.c.track_spacing;
- this.y = 0;
- Config.c.notify.connect(config_update);
- this.c.draw.connect(do_draw);
- this.add_constraint(
- new ConnectorConstraint(previous, next)
- );
- this.c.invalidate();
- previous.track.add_nodeconnector(this);
-
- }
- /**
- * Handles changes in config
- */
- private void config_update() {
- this.x = Config.c.node_height/2+Config.c.track_spacing;
- this.queue_redraw();
- }
- /**
- * Draws the Connector line
- */
- public bool do_draw(Cairo.Context cr, int w, int h) {
- cr.set_source_rgba(0,0,0,0);
- cr.set_operator(Cairo.Operator.SOURCE);
- cr.paint();
- cr.set_source_rgba(col_h2f(this.previous.color.red)*2,
- col_h2f(this.previous.color.green)*2,
- col_h2f(this.previous.color.blue)*2,
- 1);
- cr.set_line_width(Config.c.connector_stroke);
- cr.move_to(0,1);
- if (h < Config.c.node_height) {
- cr.rel_line_to(w,0);
- } else {
- cr.rel_curve_to(w,0,0,h-Config.c.connector_stroke,w,h-Config.c.connector_stroke);
- }
- cr.stroke();
- return true;
- }
- /**
- * Fade in
- */
- public void emerge() {
- this.visible = true;
- this.save_easing_state();
- this.opacity = 0xFF;
- this.restore_easing_state();
- }
- /**
- * Fade out
- */
- public void disappear() {
- this.save_easing_state();
- this.opacity = 0x00;
- this.restore_easing_state();
- }
- }
- /**
- * This class represents a Node. A node is a point in the history-tree
- * of a track. A node represents a call to a website and the result of
- * those calls.
- */
- public class Node : Focusable {
- /**
- * Reference to the node that spawned this node
- */
- private weak Node? previous;
- /**
- * Contains all nodes that have been spawned from this node
- */
- public Gee.ArrayList<Node> childnodes {get {return this._childnodes;}}
- private Gee.ArrayList<Node> _childnodes; //special list only for nodes
- /**
- * The HistoryTrack that this Node belongs to
- */
- public HistoryTrack track {get; set;}
- /**
- * The color in which this Node is displayed. The color is being derived
- * from the associated Track's color
- */
- public Clutter.Color color {get;set;}
- private Connector? connector;
- protected Clutter.ClickAction clickaction;
- /**
- * Constructs a node
- */
- public Node(HistoryTrack track, Node? par) {
- if (par != null) {
- par.childnodes.add(this);
- this.previous = par;
- if (this.previous.childnodes.size-1 > this.previous.index_of_child(this)) {
- this.previous.recalculate_nodes();
- }
- }
- track.add_node(this);
- this._childnodes = new Gee.ArrayList<Node>();
- this._track = track;
- this.x = par != null ? par.x : 0;
- this.y = Config.c.track_spacing;
- this.save_easing_state();
- this.x = par.x+par.width+(float)Config.c.node_spacing;
- this.y = Config.c.track_spacing;
- this.restore_easing_state();
- if (par != null){
- this.connector = new Connector(par,this);
- }
- this.height = this.width = Config.c.node_height;
- Config.c.notify.connect(config_update);
- this.color = track.get_background_color().lighten();
- this.color = this.color.lighten();
- this.previous.recalculate_y(null);
- this.reactive = true;
- this.clickaction = new Clutter.ClickAction();
- this.add_action(this.clickaction);
- Focus.S().focused_object = this;
- }
- protected virtual void config_update() {
- this.height = this.width = Config.c.node_height;
- this.x = this.previous.x+this.previous.width+(float)Config.c.node_spacing;
- this.y = Config.c.track_spacing;
- this.queue_redraw();
- this.previous.recalculate_y(null);
- }
- /**
- * Declares this node a rootnode by removing the reference to any previous Node
- */
- public void make_root_node() {
- this.previous = null;
- }
- /**
- * Takes this node an all its childnodes, creates a new track, removes said
- * nodes from their current track and assigns them to the newly created track
- */
- public void move_to_new_track() {
- SiteNode? new_track_current_node = null;
- string new_track_search_string = "";
- var prv = this.previous;
- if (prv != null) {
- bool need_new_current_node = this.contains_current_node();
- prv.childnodes.remove(this);
- prv.recalculate_y(null);
- prv.track.calculate_height();
- if (need_new_current_node) {
- new_track_current_node = this.track.current_node as SiteNode;
- new_track_search_string = this.track.web.get_search_string();
- this.track.web.stop_search();
- if (prv is SiteNode)
- prv.track.current_node = prv as SiteNode;
- }
- } else {
- this.track.delete_track();
- }
- this.get_parent().remove_child(this);
- this.connector.destroy();
- this.detach_childnodes();
- this.track.tracklist.add_track_with_node(this,
- new_track_current_node,
- new_track_search_string);
- }
- /**
- * Returns the Index in the childnodes-list of the given child-node
- */
- private int index_of_child(Node n) {
- return this.childnodes.index_of(n);
- }
- /**
- * Returns, into how many side-branches this node holds
- * (in general the number of children-1) except when the
- * node has only one child.
- * This is used to calculate how much offset a node must have in order
- * to render a proper non-entangled graphical tree representation
- */
- public int get_splits() {
- int r = 0;
- foreach (Node n in this.childnodes) {
- r += n.get_splits();
- }
- if (this.childnodes.size > 1) {
- r += this.childnodes.size-1;
- }
- return r;
- }
- /**
- * Returns how many splits there are until the given childnode-index
- */
- public int get_splits_until(int index) {
- int r = 0;
- for (int i = 0; i < index; ++i) {
- r += (this.childnodes.get(i) as Node).get_splits();
- }
- return r;
- }
- /**
- * Determines whether the subtree under this node contains the
- * current_node of the track.
- */
- public bool contains_current_node() {
- foreach (Node n in this.childnodes) {
- if (n == this.track.current_node || n.contains_current_node()) {
- return true;
- }
- }
- return false;
- }
- /**
- * Takes care of recursively deleting this node and all child nodes.
- * Causes this Node's track to recalculate its height and rerender
- * the node-tree.
- */
- public void delete_node(bool rec_initial=true) {
- bool need_new_current_node = false;
- if (rec_initial) {
- need_new_current_node = this == this.track.current_node || this.contains_current_node();
- }
- var prv = this.previous;
- Gee.ArrayList<Node> nodes = new Gee.ArrayList<Node>();
- foreach (Node n in this.childnodes) {
- nodes.add(n);
- }
- foreach (Node n in nodes) {
- n.delete_node(false);
- }
- prv.childnodes.remove(this);
- if (this.contains(Focus.S()))
- this.remove_child(Focus.S());
- this.connector.destroy();
- this.destroy();
- prv.recalculate_y(null);
- if (rec_initial){
- if (prv == null) {
- //This was the root node. the track is not necessary anymore, delete it.
- this.track.delete_track();
- //Focus current_node of next track
- Focus.S().focused_object = this.get_down_focusable();
- } else {
- //Recalculate the tracks height in case there is some free space now
- this.track.calculate_height();
- if (need_new_current_node && prv is SiteNode) {
- this.track.current_node = prv as SiteNode;
- }
- //Focus previous
- Focus.S().focused_object = this.get_left_focusable();
- }
- }
- }
- /**
- * Handles right-clicking on a node
- */
- public void do_clicked() {
- switch (this.clickaction.get_button()) {
- case 3: //Right mousebutton
- Application.S().context.set_context(this.track,this);
- Application.S().context.popup(null,null,null,
- 3,Gtk.get_current_event_time());
- break;
- }
- this.track.clickaction.release(); //TODO: ugly fix.. there has to be a better way
- // Prevents nodes from hanging in a pressed
- // state after they have been clicked.
- }
- /**
- * Lets each childnode of this node recalculate its y-coordinate positions
- */
- public void recalculate_nodes() {
- foreach (Node n in this.childnodes) {
- n.recalculate_y(this);
- }
- }
- /**
- * Recalculates this Node's y-coordinate position for the graphical tree
- * representation.
- */
- public void recalculate_y(Node? call_origin) {
- if (this.previous != null && call_origin != this.previous) {
- this.previous.recalculate_y(this);
- return;
- } else {
- int node_index = this.previous.index_of_child((Node) this);
- if (node_index == -1)
- warning(_("The node is not a child of its parent. This should not happen"));
- int splits_until = this.previous.get_splits_until(node_index);
- var prvy = this.previous.y != 0 ? this.previous.y : Config.c.track_spacing;
- this.y = prvy + (splits_until+node_index)*(Config.c.node_height+Config.c.track_spacing);
- foreach (Node n in this.childnodes) {
- n.recalculate_y(this);
- }
- }
- }
- /**
- * Returns this Node's previous node if any.
- * If it returns null, this node is a root node.
- */
- public Node? get_previous() {
- return this.previous;
- }
- /**
- * Deletes any reference to this node from a parent node and destroys
- * the Connector that connects the two.
- */
- private void detach_childnodes() {
- foreach (Node n in this.childnodes) {
- n.detach_childnodes();
- }
- this.get_parent().remove_child(this);
- this.connector.destroy();
- }
- /**
- * Ensures that this Node and its Connector have colors according to their Track
- */
- protected void adapt_to_track() {
- if (this.previous != null) {
- this.connector = new Connector(this.previous, this);
- }
- }
- /**
- * Serialize this nodes and its childnodes recursively into JSON
- */
- public void to_json(Json.Builder b) {
- b.set_member_name("nodes");
- b.begin_array();
- foreach (Node n in this.childnodes) {
- if (n is SiteNode)
- (n as SiteNode).to_json(b);
- }
- b.end_array();
- }
- /**
- * Tries to return the next sibling that resides on the
- * same tree-depth as this node.
- */
- public Node? get_next_on_same_level(Node node, uint level=0) {
- if (this.childnodes.size > this.index_of_child(node)+1) {
- Node n = this.childnodes[this.index_of_child(node)+1];
- for (int i = 0; i < level; i++) {
- if (n.childnodes.size > 0)
- n = n.childnodes[0];
- else
- return null;
- }
- return n;
- } else {
- if (this.previous != null)
- return this.previous.get_next_on_same_level(this, ++level);
- else
- return null;
- }
- }
- /**
- * Tries to return the previous sibling that resides on the
- * same tree-depth as this node.
- */
- public Node? get_previous_on_same_level(Node node, uint level=0) {
- if (this.index_of_child(node) > 0) {
- Node n = this.childnodes[this.index_of_child(node)-1];
- for (int i = 0; i < level; i++) {
- if (n.childnodes.size > 0)
- n = n.childnodes[n.childnodes.size-1];
- else
- return null;
- }
- return n;
- } else {
- if (this.previous != null)
- return this.previous.get_previous_on_same_level(this, ++level);
- else
- return null;
- }
- }
- public override Focusable? get_left_focusable() {
- return this.previous;
- }
- public override Focusable? get_right_focusable() {
- if (this.childnodes.size > 0)
- return this.childnodes[0];
- else
- return null;
- }
- public override Focusable? get_down_focusable() {
- Node? n = this.previous.get_next_on_same_level(this);
- if (n != null)
- return n;
- else {
- Track? t = (this.track.get_next_sibling() as Track);
- if (t != null && t is HistoryTrack) {
- return (t as HistoryTrack).current_node;
- } else {
- return Application.S().tracklist.get_empty_track().get_go_button();
- }
- }
- }
- public override Focusable? get_up_focusable() {
- Node? n = this.previous.get_previous_on_same_level(this);
- if (n != null)
- return n;
- else {
- Track? t = (this.track.get_previous_sibling() as Track);
- if (t != null && t is HistoryTrack) {
- return (t as HistoryTrack).current_node;
- } else
- return null;
- }
- }
- public override void focus_activate() {
- if (this is SiteNode) {
- this.track.current_node = this;
- Application.S().state = NormalState.S();
- }
- }
- }
- }
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