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//
// Scroller.cs
//
// Author:
// Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// Copyright (c) 2016 jp
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
using System;
using System.Xml.Serialization;
using System.ComponentModel;
using System.Diagnostics;
using Cairo;
namespace Crow
{
public class Scroller : Container
{
bool _verticalScrolling;
bool _horizontalScrolling;
bool _scrollbarVisible;
double _scrollX = 0.0;
double _scrollY = 0.0;
int scrollSpeed;
public event EventHandler<ScrollingEventArgs> Scrolled;
#region public properties
[XmlAttributeAttribute][DefaultValue(true)]
public bool VerticalScrolling {
get { return _verticalScrolling; }
set { _verticalScrolling = value; }
}
[XmlAttributeAttribute][DefaultValue(false)]
public bool HorizontalScrolling {
get { return _horizontalScrolling; }
set { _horizontalScrolling = value; }
}
[XmlAttributeAttribute][DefaultValue(true)]
public bool ScrollbarVisible {
get { return _scrollbarVisible; }
set { _scrollbarVisible = value; }
}
[XmlAttributeAttribute][DefaultValue(0.0)]
public double ScrollX {
get {
return _scrollX;
}
set {
if (_scrollX == value)
return;
if (value < 0.0)
_scrollX = 0.0;
else if (value > Child.Slot.Width - ClientRectangle.Width)
_scrollX = Math.Max(0.0, Child.Slot.Width - ClientRectangle.Width);
else
_scrollX = value;
NotifyValueChanged("ScrollX", _scrollX);
RegisterForRedraw ();
Scrolled.Raise (this, new ScrollingEventArgs (Orientation.Horizontal));
}
}
[XmlAttributeAttribute][DefaultValue(0.0)]
public double ScrollY {
get {
return _scrollY;
}
set {
if (_scrollY == value)
return;
if (value < 0.0)
_scrollY = 0.0;
else if (value > Child.Slot.Height - ClientRectangle.Height)
_scrollY = Math.Max(0.0,Child.Slot.Height - ClientRectangle.Height);
else
_scrollY = value;
NotifyValueChanged("ScrollY", _scrollY);
RegisterForRedraw ();
Scrolled.Raise (this, new ScrollingEventArgs (Orientation.Vertical));
}
}
[XmlIgnore]
public int MaximumScroll {
get {
try {
return VerticalScrolling ?
Math.Max(Child.Slot.Height - ClientRectangle.Height,0) :
Math.Max(Child.Slot.Width - ClientRectangle.Width,0);
} catch {
return 0;
}
}
}
[XmlAttributeAttribute][DefaultValue(30)]
public int ScrollSpeed {
get { return scrollSpeed; }
set {
scrollSpeed = value;
NotifyValueChanged("ScrollSpeed", scrollSpeed);
}
}
#endregion
public Scroller()
: base(){}
#region GraphicObject Overrides
//TODO:put this override in style
[XmlAttributeAttribute()][DefaultValue(false)]
public override bool CacheEnabled {
get { return base.CacheEnabled; }
set { base.CacheEnabled = value; }
}
void OnChildLayoutChanges (object sender, LayoutingEventArgs arg)
{
int maxScroll = MaximumScroll;
if (_verticalScrolling) {
if (arg.LayoutType == LayoutingType.Height) {
if (maxScroll < ScrollY) {
Debug.WriteLine ("scrolly={0} maxscroll={1}", ScrollY, maxScroll);
ScrollY = 0;
}
NotifyValueChanged("MaximumScroll", maxScroll);
}
} else if (arg.LayoutType == LayoutingType.Width) {
if (maxScroll < ScrollX)
ScrollX = 0;
NotifyValueChanged("MaximumScroll", maxScroll);
}
}
void onChildListCleared(object sender, EventArgs e){
ScrollY = 0;
ScrollX = 0;
}
public override void SetChild (GraphicObject _child)
{
GraphicObject c = child as GraphicObject;
Group g = child as Group;
if (c != null) {
c.LayoutChanged -= OnChildLayoutChanges;
if (g != null)
g.ChildrenCleared -= onChildListCleared;
}
c = _child as GraphicObject;
g = _child as Group;
if (c != null) {
c.LayoutChanged += OnChildLayoutChanges;
if (g != null)
g.ChildrenCleared += onChildListCleared;
}
base.SetChild (_child);
}
#endregion
#region Mouse handling
internal Point savedMousePos;
public override bool MouseIsIn (Point m)
{
return Visible ? base.ScreenCoordinates(Slot).ContainsOrIsEqual (m) : false;
}
public override void checkHoverWidget (MouseMoveEventArgs e)
{
savedMousePos = e.Position;
Point m = e.Position - new Point ((int)ScrollX, (int)ScrollY);
base.checkHoverWidget (new MouseMoveEventArgs(m.X,m.Y,e.XDelta,e.YDelta));
}
public override void onMouseWheel (object sender, MouseWheelEventArgs e)
{
if (Child == null)
return;
if (VerticalScrolling )
ScrollY -= e.Delta * ScrollSpeed;
if (HorizontalScrolling )
ScrollX -= e.Delta * ScrollSpeed;
}
public override void onMouseMove (object sender, MouseMoveEventArgs e)
{
savedMousePos.X += e.XDelta;
savedMousePos.Y += e.YDelta;
base.onMouseMove (sender, new MouseMoveEventArgs(savedMousePos.X,savedMousePos.Y,e.XDelta,e.YDelta));
}
public override void RegisterClip (Rectangle clip)
{
base.RegisterClip (clip - new Point((int)ScrollX,(int)ScrollY));
}
#endregion
public override Rectangle ScreenCoordinates (Rectangle r)
{
return base.ScreenCoordinates (r) - new Point((int)ScrollX,(int)ScrollY);
}
protected override void onDraw (Context gr)
{
Rectangle rBack = new Rectangle (Slot.Size);
Background.SetAsSource (gr, rBack);
CairoHelpers.CairoRectangle(gr,rBack, CornerRadius);
gr.Fill ();
gr.Save ();
if (ClipToClientRect) {
//clip to scrolled client zone
CairoHelpers.CairoRectangle (gr, ClientRectangle, CornerRadius);
gr.Clip ();
}
gr.Translate (-ScrollX, -ScrollY);
if (child != null)
child.Paint (ref gr);
gr.Restore ();
}
}
}
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