mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-01 11:56:58 -05:00
352 lines
9.3 KiB
JavaScript
352 lines
9.3 KiB
JavaScript
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namespace("WM");
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WM.Treeview = (function()
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{
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var Margin = 10;
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var tree_template_html = " \
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<div class='Treeview'> \
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<div class='TreeviewItemChildren' style='width:90%;float:left'></div> \
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<div class='TreeviewScrollbarInset'> \
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<div class='TreeviewScrollbar'></div> \
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</div> \
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<div style='clear:both'></div> \
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</div>";
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var item_template_html = " \
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<div class='TreeViewItem basicfont notextsel'> \
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<img src='' class='TreeviewItemImage'> \
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<div class='TreeviewItemText'></div> \
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<div style='clear:both'></div> \
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<div class='TreeviewItemChildren'></div> \
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<div style='clear:both'></div> \
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</div>";
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// TODO: Remove parent_node (required for stuff that doesn't use the WM yet)
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function Treeview(x, y, width, height, parent_node)
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{
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// Cache initialisation options
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this.ParentNode = parent_node;
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this.Position = [ x, y ];
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this.Size = [ width, height ];
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this.Node = null;
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this.ScrollbarNode = null;
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this.SelectedItem = null;
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this.ContentsNode = null;
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// Setup options
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this.HighlightOnHover = false;
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this.EnableScrollbar = true;
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this.HorizontalLayoutDepth = 1;
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// Generate an empty tree
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this.Clear();
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}
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Treeview.prototype.SetHighlightOnHover = function(highlight)
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{
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this.HighlightOnHover = highlight;
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}
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Treeview.prototype.SetEnableScrollbar = function(enable)
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{
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this.EnableScrollbar = enable;
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}
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Treeview.prototype.SetHorizontalLayoutDepth = function(depth)
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{
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this.HorizontalLayoutDepth = depth;
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}
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Treeview.prototype.SetNodeSelectedHandler = function(handler)
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{
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this.NodeSelectedHandler = handler;
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}
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Treeview.prototype.Clear = function()
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{
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this.RootItem = new WM.TreeviewItem(this, null, null, null, null);
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this.GenerateHTML();
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}
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Treeview.prototype.Root = function()
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{
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return this.RootItem;
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}
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Treeview.prototype.ClearSelection = function()
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{
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if (this.SelectedItem != null)
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{
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DOM.Node.RemoveClass(this.SelectedItem.Node, "TreeviewItemSelected");
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this.SelectedItem = null;
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}
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}
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Treeview.prototype.SelectItem = function(item, mouse_pos)
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{
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// Notify the select handler
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if (this.NodeSelectedHandler)
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this.NodeSelectedHandler(item.Node, this.SelectedItem, item, mouse_pos);
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// Remove highlight from the old selection
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this.ClearSelection();
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// Swap in new selection and apply highlight
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this.SelectedItem = item;
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DOM.Node.AddClass(this.SelectedItem.Node, "TreeviewItemSelected");
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}
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Treeview.prototype.GenerateHTML = function()
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{
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// Clone the template and locate important nodes
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var old_node = this.Node;
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this.Node = DOM.Node.CreateHTML(tree_template_html);
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this.ChildrenNode = DOM.Node.FindWithClass(this.Node, "TreeviewItemChildren");
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this.ScrollbarNode = DOM.Node.FindWithClass(this.Node, "TreeviewScrollbar");
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DOM.Node.SetPosition(this.Node, this.Position);
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DOM.Node.SetSize(this.Node, this.Size);
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// Generate the contents of the treeview
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GenerateTree(this, this.ChildrenNode, this.RootItem.Children, 0);
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// Cross-browser (?) means of adding a mouse wheel handler
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var mouse_wheel_event = (/Firefox/i.test(navigator.userAgent)) ? "DOMMouseScroll" : "mousewheel";
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DOM.Event.AddHandler(this.Node, mouse_wheel_event, Bind(OnMouseScroll, this));
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DOM.Event.AddHandler(this.Node, "dblclick", Bind(OnMouseDoubleClick, this));
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DOM.Event.AddHandler(this.Node, "mousedown", Bind(OnMouseDown, this));
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DOM.Event.AddHandler(this.Node, "mouseup", OnMouseUp);
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// Swap in the newly generated control node if it's already been attached to a parent
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if (old_node && old_node.parentNode)
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{
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old_node.parentNode.removeChild(old_node);
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this.ParentNode.appendChild(this.Node);
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}
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if (this.EnableScrollbar)
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{
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this.UpdateScrollbar();
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DOM.Event.AddHandler(this.ScrollbarNode, "mousedown", Bind(OnMouseDown_Scrollbar, this));
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DOM.Event.AddHandler(this.ScrollbarNode, "mouseup", Bind(OnMouseUp_Scrollbar, this));
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DOM.Event.AddHandler(this.ScrollbarNode, "mouseout", Bind(OnMouseUp_Scrollbar, this));
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DOM.Event.AddHandler(this.ScrollbarNode, "mousemove", Bind(OnMouseMove_Scrollbar, this));
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}
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else
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{
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DOM.Node.Hide(DOM.Node.FindWithClass(this.Node, "TreeviewScrollbarInset"));
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}
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}
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Treeview.prototype.UpdateScrollbar = function()
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{
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if (!this.EnableScrollbar)
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return;
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var scrollbar_scale = Math.min((this.Node.offsetHeight - Margin * 2) / this.ChildrenNode.offsetHeight, 1);
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this.ScrollbarNode.style.height = parseInt(scrollbar_scale * 100) + "%";
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// Shift the scrollbar container along with the parent window
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this.ScrollbarNode.parentNode.style.top = this.Node.scrollTop;
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var scroll_fraction = this.Node.scrollTop / (this.Node.scrollHeight - this.Node.offsetHeight);
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var max_height = this.Node.offsetHeight - Margin;
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var max_scrollbar_offset = max_height - this.ScrollbarNode.offsetHeight;
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var scrollbar_offset = scroll_fraction * max_scrollbar_offset;
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this.ScrollbarNode.style.top = scrollbar_offset;
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}
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function GenerateTree(self, parent_node, items, depth)
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{
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if (items.length == 0)
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return null;
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for (var i in items)
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{
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var item = items[i];
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// Create the node for this item and locate important nodes
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var node = DOM.Node.CreateHTML(item_template_html);
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var img = DOM.Node.FindWithClass(node, "TreeviewItemImage");
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var text = DOM.Node.FindWithClass(node, "TreeviewItemText");
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var children = DOM.Node.FindWithClass(node, "TreeviewItemChildren");
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// Attach the item to the node
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node.TreeviewItem = item;
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item.Node = node;
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// Add the class which highlights selection on hover
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if (self.HighlightOnHover)
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DOM.Node.AddClass(node, "TreeviewItemHover");
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// Instruct the children to wrap around
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if (depth >= self.HorizontalLayoutDepth)
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node.style.cssFloat = "left";
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if (item.OpenImage == null || item.CloseImage == null)
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{
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// If there no images, remove the image node
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node.removeChild(img);
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}
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else
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{
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// Set the image source to open
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img.src = item.OpenImage.src;
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img.style.width = item.OpenImage.width;
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img.style.height = item.OpenImage.height;
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item.ImageNode = img;
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}
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// Setup the text to display
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text.innerHTML = item.Label;
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// Add the div to the parent and recurse into children
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parent_node.appendChild(node);
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GenerateTree(self, children, item.Children, depth + 1);
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item.ChildrenNode = children;
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}
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// Clear the wrap-around
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if (depth >= self.HorizontalLayoutDepth)
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DOM.Node.AppendClearFloat(parent_node.parentNode);
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}
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function OnMouseScroll(self, evt)
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{
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// Get mouse wheel movement
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var delta = evt.detail ? evt.detail * -1 : evt.wheelDelta;
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delta *= 8;
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// Scroll the main window with wheel movement and clamp
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self.Node.scrollTop -= delta;
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self.Node.scrollTop = Math.min(self.Node.scrollTop, (self.ChildrenNode.offsetHeight - self.Node.offsetHeight) + Margin * 2);
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self.UpdateScrollbar();
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}
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function OnMouseDoubleClick(self, evt)
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{
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DOM.Event.StopDefaultAction(evt);
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// Get the tree view item being clicked, if any
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var node = DOM.Event.GetNode(evt);
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var tvitem = GetTreeviewItemFromNode(self, node);
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if (tvitem == null)
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return;
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if (tvitem.Children.length)
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tvitem.Toggle();
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}
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function OnMouseDown(self, evt)
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{
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DOM.Event.StopDefaultAction(evt);
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// Get the tree view item being clicked, if any
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var node = DOM.Event.GetNode(evt);
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var tvitem = GetTreeviewItemFromNode(self, node);
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if (tvitem == null)
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return;
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// If clicking on the image, expand any children
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if (node.tagName == "IMG" && tvitem.Children.length)
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{
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tvitem.Toggle();
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}
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else
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{
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var mouse_pos = DOM.Event.GetMousePosition(evt);
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self.SelectItem(tvitem, mouse_pos);
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}
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}
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function OnMouseUp(evt)
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{
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// Event handler used merely to stop events bubbling up to containers
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DOM.Event.StopPropagation(evt);
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}
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function OnMouseDown_Scrollbar(self, evt)
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{
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self.ScrollbarHeld = true;
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// Cache the mouse height relative to the scrollbar
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self.LastY = evt.clientY;
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self.ScrollY = self.Node.scrollTop;
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DOM.Node.AddClass(self.ScrollbarNode, "TreeviewScrollbarHeld");
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DOM.Event.StopDefaultAction(evt);
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}
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function OnMouseUp_Scrollbar(self, evt)
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{
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self.ScrollbarHeld = false;
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DOM.Node.RemoveClass(self.ScrollbarNode, "TreeviewScrollbarHeld");
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}
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function OnMouseMove_Scrollbar(self, evt)
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{
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if (self.ScrollbarHeld)
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{
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var delta_y = evt.clientY - self.LastY;
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self.LastY = evt.clientY;
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var max_height = self.Node.offsetHeight - Margin;
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var max_scrollbar_offset = max_height - self.ScrollbarNode.offsetHeight;
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var max_contents_scroll = self.Node.scrollHeight - self.Node.offsetHeight;
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var scale = max_contents_scroll / max_scrollbar_offset;
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// Increment the local float variable and assign, as scrollTop is of type int
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self.ScrollY += delta_y * scale;
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self.Node.scrollTop = self.ScrollY;
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self.Node.scrollTop = Math.min(self.Node.scrollTop, (self.ChildrenNode.offsetHeight - self.Node.offsetHeight) + Margin * 2);
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self.UpdateScrollbar();
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}
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}
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function GetTreeviewItemFromNode(self, node)
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{
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// Walk up toward the tree view node looking for this first item
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while (node && node != self.Node)
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{
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if ("TreeviewItem" in node)
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return node.TreeviewItem;
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node = node.parentNode;
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}
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return null;
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}
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return Treeview;
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})();
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