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//
// PathBar.cs
//
// Author:
// Michael Hutchinson <mhutchinson@novell.com>
//
// Copyright (c) 2010 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Linq;
using Gtk;
using Gdk;
using MonoDevelop.Ide;
using MonoDevelop.Ide.Gui;
namespace MonoDevelop.Components
{
public enum EntryPosition
{
Left,
Right
}
public class PathEntry
{
Gdk.Pixbuf darkIcon;
public Gdk.Pixbuf Icon {
get;
private set;
}
public string Markup {
get;
private set;
}
public object Tag {
get;
set;
}
public bool IsPathEnd {
get;
set;
}
public EntryPosition Position {
get;
set;
}
public PathEntry (Gdk.Pixbuf icon, string markup)
{
this.Icon = icon;
this.Markup = markup;
}
public PathEntry (string markup)
{
this.Markup = markup;
}
public override bool Equals (object obj)
{
if (obj == null)
return false;
if (ReferenceEquals (this, obj))
return true;
if (obj.GetType () != typeof(PathEntry))
return false;
MonoDevelop.Components.PathEntry other = (MonoDevelop.Components.PathEntry)obj;
return Icon == other.Icon && Markup == other.Markup;
}
public override int GetHashCode ()
{
unchecked {
return (Icon != null ? Icon.GetHashCode () : 0) ^ (Markup != null ? Markup.GetHashCode () : 0);
}
}
internal Gdk.Pixbuf DarkIcon {
get {
if (darkIcon == null && Icon != null) {
darkIcon = Icon;
if (Styles.BreadcrumbGreyscaleIcons)
darkIcon = ImageService.MakeGrayscale (darkIcon);
if (Styles.BreadcrumbInvertedIcons)
darkIcon = ImageService.MakeInverted (darkIcon);
}
return darkIcon;
}
}
}
class PathBar : Gtk.DrawingArea
{
PathEntry[] leftPath = new PathEntry[0];
PathEntry[] rightPath = new PathEntry[0];
Pango.Layout layout;
Pango.AttrList boldAtts = new Pango.AttrList ();
//HACK: a surrogate widget object to pass to style calls instead of "this" when using "button" hint.
// This avoids GTK-Criticals in themes which try to cast the widget object to a button.
Gtk.Button styleButton = new Gtk.Button ();
// The widths array contains the widths of the items at the left and the right
int[] widths;
int height;
int textHeight;
bool pressed, hovering, menuVisible;
int hoverIndex = -1;
int activeIndex = -1;
const int leftPadding = 6;
const int rightPadding = 6;
const int topPadding = 2;
const int bottomPadding = 4;
const int iconSpacing = 4;
const int padding = 3;
const int buttonPadding = 2;
const int arrowLeftPadding = 10;
const int arrowRightPadding = 10;
const int arrowSize = 6;
const int spacing = arrowLeftPadding + arrowRightPadding + arrowSize;
const int minRegionSelectorWidth = 30;
Func<int, Widget> createMenuForItem;
Widget menuWidget;
public PathBar (Func<int, Widget> createMenuForItem)
{
this.Events = EventMask.ExposureMask |
EventMask.EnterNotifyMask |
EventMask.LeaveNotifyMask |
EventMask.ButtonPressMask |
EventMask.ButtonReleaseMask |
EventMask.KeyPressMask |
EventMask.PointerMotionMask;
boldAtts.Insert (new Pango.AttrWeight (Pango.Weight.Bold));
this.createMenuForItem = createMenuForItem;
EnsureLayout ();
}
public new PathEntry[] Path { get; private set; }
public int ActiveIndex { get { return activeIndex; } }
public void SetPath (PathEntry[] path)
{
if (ArrSame (this.leftPath, path))
return;
HideMenu ();
this.Path = path ?? new PathEntry[0];
this.leftPath = Path.Where (p => p.Position == EntryPosition.Left).ToArray ();
this.rightPath = Path.Where (p => p.Position == EntryPosition.Right).ToArray ();
activeIndex = -1;
widths = null;
EnsureWidths ();
QueueResize ();
}
bool ArrSame (PathEntry[] a, PathEntry[] b)
{
if ((a == null || b == null) && a != b)
return false;
if (a.Length != b.Length)
return false;
for (int i = 0; i < a.Length; i++)
if (!a[i].Equals(b[i]))
return false;
return true;
}
public void SetActive (int index)
{
if (index >= leftPath.Length)
throw new IndexOutOfRangeException ();
if (activeIndex != index) {
activeIndex = index;
widths = null;
QueueResize ();
}
}
protected override void OnSizeRequested (ref Requisition requisition)
{
EnsureWidths ();
requisition.Width = Math.Max (WidthRequest, 0);
requisition.Height = height + topPadding + bottomPadding;
}
protected override bool OnExposeEvent (EventExpose evnt)
{
using (var ctx = Gdk.CairoHelper.Create (GdkWindow)) {
ctx.Rectangle (0, 0, Allocation.Width, Allocation.Height);
using (var g = new Cairo.LinearGradient (0, 0, 0, Allocation.Height)) {
g.AddColorStop (0, Styles.BreadcrumbBackgroundColor);
g.AddColorStop (1, Styles.BreadcrumbGradientEndColor);
ctx.Pattern = g;
}
ctx.Fill ();
if (widths == null)
return true;
// Calculate the total required with, and the reduction to be applied in case it doesn't fit the available space
int totalWidth = widths.Sum ();
totalWidth += leftPadding + (arrowSize + arrowRightPadding) * leftPath.Length - 1;
totalWidth += rightPadding + arrowSize * rightPath.Length - 1;
int[] currentWidths = widths;
bool widthReduced = false;
int overflow = totalWidth - Allocation.Width;
if (overflow > 0) {
currentWidths = ReduceWidths (overflow);
widthReduced = true;
}
// Render the paths
int textTopPadding = topPadding + (height - textHeight) / 2;
int xpos = leftPadding, ypos = topPadding;
for (int i = 0; i < leftPath.Length; i++) {
bool last = i == leftPath.Length - 1;
// Reduce the item size when required
int itemWidth = currentWidths [i];
int x = xpos;
xpos += itemWidth;
if (hoverIndex >= 0 && hoverIndex < Path.Length && leftPath [i] == Path [hoverIndex] && (menuVisible || pressed || hovering))
DrawButtonBorder (ctx, x - padding, itemWidth + padding + padding);
int textOffset = 0;
if (leftPath [i].DarkIcon != null) {
int iy = (height - leftPath [i].DarkIcon.Height) / 2 + topPadding;
Gdk.CairoHelper.SetSourcePixbuf (ctx, leftPath [i].DarkIcon, x, iy);
ctx.Paint ();
textOffset += leftPath [i].DarkIcon.Width + iconSpacing;
}
layout.Attributes = (i == activeIndex) ? boldAtts : null;
layout.SetMarkup (leftPath [i].Markup);
ctx.Save ();
// If size is being reduced, ellipsize it
bool showText = true;
if (widthReduced) {
int w = itemWidth - textOffset;
if (w > 0) {
ctx.Rectangle (x + textOffset, textTopPadding, w, height);
ctx.Clip ();
} else
showText = false;
} else
layout.Width = -1;
if (showText) {
// Text
ctx.Color = Styles.BreadcrumbTextColor.ToCairoColor ();
ctx.MoveTo (x + textOffset, textTopPadding);
PangoCairoHelper.ShowLayout (ctx, layout);
}
ctx.Restore ();
if (!last) {
xpos += arrowLeftPadding;
if (leftPath [i].IsPathEnd) {
Style.PaintVline (Style, GdkWindow, State, evnt.Area, this, "", ypos, ypos + height, xpos - arrowSize / 2);
} else {
int arrowH = Math.Min (height, arrowSize);
int arrowY = ypos + (height - arrowH) / 2;
DrawPathSeparator (ctx, xpos, arrowY, arrowH);
}
xpos += arrowSize + arrowRightPadding;
}
}
int xposRight = Allocation.Width - rightPadding;
for (int i = 0; i < rightPath.Length; i++) {
// bool last = i == rightPath.Length - 1;
// Reduce the item size when required
int itemWidth = currentWidths [i + leftPath.Length];
xposRight -= itemWidth;
xposRight -= arrowSize;
int x = xposRight;
if (hoverIndex >= 0 && hoverIndex < Path.Length && rightPath [i] == Path [hoverIndex] && (menuVisible || pressed || hovering))
DrawButtonBorder (ctx, x - padding, itemWidth + padding + padding);
int textOffset = 0;
if (rightPath [i].DarkIcon != null) {
Gdk.CairoHelper.SetSourcePixbuf (ctx, rightPath [i].DarkIcon, x, ypos);
ctx.Paint ();
textOffset += rightPath [i].DarkIcon.Width + padding;
}
layout.Attributes = (i == activeIndex) ? boldAtts : null;
layout.SetMarkup (rightPath [i].Markup);
ctx.Save ();
// If size is being reduced, ellipsize it
bool showText = true;
if (widthReduced) {
int w = itemWidth - textOffset;
if (w > 0) {
ctx.Rectangle (x + textOffset, textTopPadding, w, height);
ctx.Clip ();
} else
showText = false;
} else
layout.Width = -1;
if (showText) {
// Text
ctx.Color = Styles.BreadcrumbTextColor.ToCairoColor ();
ctx.MoveTo (x + textOffset, textTopPadding);
PangoCairoHelper.ShowLayout (ctx, layout);
}
ctx.Restore ();
}
ctx.MoveTo (0, Allocation.Height - 0.5);
ctx.RelLineTo (Allocation.Width, 0);
ctx.Color = Styles.BreadcrumbBottomBorderColor;
ctx.LineWidth = 1;
ctx.Stroke ();
}
return true;
}
void DrawPathSeparator (Cairo.Context ctx, double x, double y, double size)
{
ctx.MoveTo (x, y);
ctx.LineTo (x + arrowSize, y + size / 2);
ctx.LineTo (x, y + size);
ctx.ClosePath ();
ctx.Color = CairoExtensions.ColorShade (Style.Dark (State).ToCairoColor (), 0.6);
ctx.Fill ();
}
void DrawButtonBorder (Cairo.Context ctx, double x, double width)
{
x -= buttonPadding;
width += buttonPadding;
double y = topPadding - buttonPadding;
double height = Allocation.Height - topPadding - bottomPadding + buttonPadding * 2;
ctx.Rectangle (x, y, width, height);
ctx.Color = Styles.BreadcrumbButtonFillColor;
ctx.Fill ();
ctx.Rectangle (x + 0.5, y + 0.5, width - 1, height - 1);
ctx.Color = Styles.BreadcrumbButtonBorderColor;
ctx.LineWidth = 1;
ctx.Stroke ();
}
int[] ReduceWidths (int overflow)
{
int minItemWidth = 30;
int[] currentWidths = new int[widths.Length];
Array.Copy (widths, currentWidths, widths.Length);
int itemsToShrink = widths.Count (i => i > minItemWidth);
while (overflow > 0 && itemsToShrink > 0) {
int itemSizeReduction = overflow / itemsToShrink;
if (itemSizeReduction == 0)
itemSizeReduction = 1;
int reduced = 0;
for (int n = 0; n < widths.Length && reduced < overflow; n++) {
if (currentWidths [n] > minItemWidth) {
var nw = currentWidths [n] - itemSizeReduction;
if (nw <= minItemWidth) {
nw = minItemWidth;
itemsToShrink--;
}
reduced += currentWidths [n] - nw;
currentWidths [n] = nw;
}
}
overflow -= reduced;
}
return currentWidths;
}
protected override bool OnButtonPressEvent (EventButton evnt)
{
if (hovering) {
pressed = true;
QueueDraw ();
}
return true;
}
protected override bool OnButtonReleaseEvent (EventButton evnt)
{
pressed = false;
if (hovering) {
QueueDraw ();
ShowMenu ();
}
return true;
}
void ShowMenu ()
{
if (hoverIndex < 0)
return;
HideMenu ();
menuWidget = createMenuForItem (hoverIndex);
if (menuWidget == null)
return;
menuWidget.Hidden += delegate {
menuVisible = false;
QueueDraw ();
//FIXME: for some reason the menu's children don't get activated if we destroy
//directly here, so use a timeout to delay it
GLib.Timeout.Add (100, delegate {
HideMenu ();
return false;
});
};
menuVisible = true;
if (menuWidget is Menu) {
((Menu)menuWidget).Popup (null, null, PositionFunc, 0, Gtk.Global.CurrentEventTime);
} else {
PositionWidget (menuWidget);
menuWidget.ShowAll ();
}
}
public void HideMenu ()
{
if (menuWidget != null) {
menuWidget.Destroy ();
menuWidget = null;
}
}
public int GetHoverXPosition (out int w)
{
if (Path[hoverIndex].Position == EntryPosition.Left) {
int idx = leftPath.TakeWhile (p => p != Path[hoverIndex]).Count ();
if (idx >= 0) {
w = widths[idx];
return widths.Take (idx).Sum () + idx * spacing;
}
} else {
int idx = rightPath.TakeWhile (p => p != Path[hoverIndex]).Count ();
if (idx >= 0) {
w = widths[idx + leftPath.Length];
return Allocation.Width - padding - widths[idx + leftPath.Length] - spacing;
}
}
w = Allocation.Width;
return 0;
}
void PositionWidget (Gtk.Widget widget)
{
if (!(widget is Gtk.Window))
return;
int ox, oy;
ParentWindow.GetOrigin (out ox, out oy);
int w;
int itemXPosition = GetHoverXPosition (out w);
int dx = ox + this.Allocation.X + itemXPosition;
int dy = oy + this.Allocation.Bottom;
var req = widget.SizeRequest ();
Gdk.Rectangle geometry = DesktopService.GetUsableMonitorGeometry (Screen, Screen.GetMonitorAtPoint (dx, dy));
int width = System.Math.Max (req.Width, w);
if (width >= geometry.Width - spacing * 2) {
width = geometry.Width - spacing * 2;
dx = geometry.Left + spacing;
}
widget.WidthRequest = width;
if (dy + req.Height > geometry.Bottom)
dy = oy + this.Allocation.Y - req.Height;
if (dx + width > geometry.Right)
dx = geometry.Right - width;
(widget as Gtk.Window).Move (dx, dy);
(widget as Gtk.Window).Resize (width, req.Height);
widget.GrabFocus ();
}
void PositionFunc (Menu mn, out int x, out int y, out bool push_in)
{
this.GdkWindow.GetOrigin (out x, out y);
int w;
var rect = this.Allocation;
y += rect.Height;
x += GetHoverXPosition (out w);
//if the menu would be off the bottom of the screen, "drop" it upwards
if (y + mn.Requisition.Height > this.Screen.Height) {
y -= mn.Requisition.Height;
y -= rect.Height;
}
//let GTK reposition the button if it still doesn't fit on the screen
push_in = true;
}
protected override bool OnMotionNotifyEvent (EventMotion evnt)
{
SetHover (GetItemAt ((int)evnt.X, (int)evnt.Y));
return true;
}
protected override bool OnLeaveNotifyEvent (EventCrossing evnt)
{
pressed = false;
SetHover (-1);
return true;
}
protected override bool OnEnterNotifyEvent (EventCrossing evnt)
{
SetHover (GetItemAt ((int)evnt.X, (int)evnt.Y));
return true;
}
void SetHover (int i)
{
bool oldHovering = hovering;
hovering = i > -1;
if (hoverIndex != i || oldHovering != hovering) {
if (hovering)
hoverIndex = i;
QueueDraw ();
}
}
public int IndexOf (PathEntry entry)
{
return Path.TakeWhile (p => p != entry).Count ();
}
int GetItemAt (int x, int y)
{
int xpos = padding, xposRight = Allocation.Width - padding;
if (widths == null || x < xpos || x > xposRight)
return -1;
//could do a binary search, but probably not worth it
for (int i = 0; i < leftPath.Length; i++) {
xpos += widths[i] + spacing;
if (x < xpos)
return IndexOf (leftPath[i]);
}
for (int i = 0; i < rightPath.Length; i++) {
xposRight -= widths[i + leftPath.Length] - spacing;
if (x > xposRight)
return IndexOf (rightPath[i]);
}
return -1;
}
void EnsureLayout ()
{
if (layout != null)
layout.Dispose ();
layout = new Pango.Layout (PangoContext);
}
void CreateWidthArray (int[] result, int index, PathEntry[] path)
{
// Assume that there will be icons of at least 16 pixels. This avoids
// annoying path bar height changes when switching between empty and full paths
int maxIconHeight = 16;
for (int i = 0; i < path.Length; i++) {
layout.Attributes = (i == activeIndex)? boldAtts : null;
layout.SetMarkup (path[i].Markup);
layout.Width = -1;
int w, h;
layout.GetPixelSize (out w, out h);
textHeight = Math.Max (h, textHeight);
if (path[i].DarkIcon != null) {
maxIconHeight = Math.Max (path[i].DarkIcon.Height, maxIconHeight);
w += path[i].DarkIcon.Width + iconSpacing;
}
result[i + index] = w;
}
height = Math.Max (height, maxIconHeight);
height = Math.Max (height, textHeight);
}
void EnsureWidths ()
{
if (widths != null)
return;
layout.SetText ("#");
int w;
layout.GetPixelSize (out w, out this.height);
textHeight = height;
widths = new int [leftPath.Length + rightPath.Length];
CreateWidthArray (widths, 0, leftPath);
CreateWidthArray (widths, leftPath.Length, rightPath);
}
protected override void OnStyleSet (Style previous)
{
base.OnStyleSet (previous);
KillLayout ();
EnsureLayout ();
}
void KillLayout ()
{
if (layout == null)
return;
layout.Dispose ();
layout = null;
boldAtts.Dispose ();
widths = null;
}
public override void Destroy ()
{
base.Destroy ();
styleButton.Destroy ();
KillLayout ();
this.boldAtts.Dispose ();
}
}
}
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