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// Copyright (c) 2020 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Xml.Serialization;
using System.ComponentModel;
using System.Collections;
using Crow.Drawing;
using Crow;
using System.Collections.Generic;
namespace vkChess
{
public class MoveHistoryWidget : ScrollingObject
{
IList<string> moves;
int visibleLines = 1;
FontExtents fe;
public virtual IList<string> Moves {
get => moves;
set {
if (moves == value)
return;
if (moves is ObservableList<string> ol) {
ol.ListAdd -= Lines_ListAdd;
ol.ListRemove -= Lines_ListRemove;
ol.ListClear -= Lines_ListClear;
}
moves = value;
if (moves is ObservableList<string> olNew) {
olNew.ListAdd += Lines_ListAdd;
olNew.ListRemove += Lines_ListRemove;
olNew.ListClear += Lines_ListClear;
updateMaxScrollAndFocusedIndices ();
} else
ScrollY = MaxScrollY = CurrentMoveIndex = hoverMoveIdx = 0;
NotifyValueChanged ("Moves", moves);
RegisterForGraphicUpdate ();
}
}
void updateMaxScrollAndFocusedIndices () {
MaxScrollY = moves.Count - visibleLines;
ScrollY = 0;
CurrentMoveIndex = 0;
hoverMoveIdx = - 1;
}
void Lines_ListAdd (object sender, ListChangedEventArg e)
{
updateMaxScrollAndFocusedIndices ();
RegisterForRedraw ();
}
void Lines_ListRemove (object sender, ListChangedEventArg e)
{
updateMaxScrollAndFocusedIndices ();
RegisterForRedraw ();
}
void Lines_ListClear (object sender, ListClearEventArg e)
{
ScrollY = MaxScrollY = CurrentMoveIndex = 0;
hoverMoveIdx = -1;
RegisterForRedraw ();
}
public override void OnLayoutChanges (LayoutingType layoutType)
{
base.OnLayoutChanges (layoutType);
if (layoutType == LayoutingType.Height) {
using (ImageSurface img = new ImageSurface (Format.Argb32, 10, 10)) {
using (Context gr = new Context (img)) {
//Cairo.FontFace cf = gr.GetContextFontFace ();
this.setFontForContext (gr);
fe = gr.FontExtents;
}
}
lineHeight = fe.Height + 2 * moveMargin + moveSpacing;
visibleLines = (int)Math.Floor ((double)ClientRectangle.Height / lineHeight);
MaxScrollY = moves == null ? 0 : moves.Count - visibleLines;
}
}
double lineHeight = 1;
int moveMargin = 3, moveSpacing = 2;
int hoverMoveIdx = -1, currentMoveIndex;
public int CurrentMoveIndex {
get => currentMoveIndex;
set {
if (currentMoveIndex == value)
return;
currentMoveIndex = value;
NotifyValueChangedAuto (currentMoveIndex);
RegisterForRedraw ();
}
}
protected override void onDraw (Context gr)
{
base.onDraw (gr);
if (moves == null)
return;
gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
gr.SetFontSize (Font.Size);
Rectangle r = ClientRectangle;
double y = ClientRectangle.Y;
double x = ClientRectangle.X - ScrollX;
string[] movesCopy;
lock (moves) {
movesCopy = new string[moves.Count];
moves.CopyTo (movesCopy, 0);
}
for (int i = 0; i < visibleLines; i++) {
int idx = i + ScrollY;
int mi = movesCopy.Length - (1 + idx);
if (mi < 0)
break;
string m = movesCopy[mi];
Color bg;
Color fg;
if (mi % 2 > 0) {
if (idx == currentMoveIndex) {
bg = Colors.DarkBlue;
fg = Colors.White;
} else if (idx == hoverMoveIdx) {
bg = Colors.Black;
fg = Colors.White;
} else {
bg = Colors.Black;
fg = Colors.DimGrey;
}
} else {
if (idx == currentMoveIndex) {
bg = Colors.Blue;
fg = Colors.White;
} else if (idx == hoverMoveIdx) {
bg = Colors.White;
fg = Colors.Black;
} else {
bg = Colors.Grey;
fg = Colors.DarkGrey;
}
}
gr.SetSource (bg);
gr.Rectangle (x, y, (double)r.Width, lineHeight - moveSpacing);
gr.Fill ();
y += moveMargin;
gr.SetSource (fg);
TextExtents te = gr.TextExtents(m);
gr.MoveTo (x + 0.5 * (r.Width - te.Width), y + fe.Ascent);
gr.ShowText (m);
y += fe.Height + moveMargin + moveSpacing;
}
}
public override void onMouseMove(object sender, MouseMoveEventArgs e)
{
base.onMouseMove(sender, e);
if (Moves == null) {
hoverMoveIdx = -1;
return;
}
PointD mouseLocalPos = ScreenPointToLocal (e.Position);
hoverMoveIdx = ScrollY + (int)Math.Min (Math.Max (0, Math.Floor (mouseLocalPos.Y / lineHeight)), moves.Count - 1);
RegisterForRedraw ();
}
public override void onMouseClick(object sender, MouseButtonEventArgs e)
{
if (e.Button == Glfw.MouseButton.Left) {
CurrentMoveIndex = hoverMoveIdx;
e.Handled = true;
}
base.onMouseClick(sender, e);
}
public override void onMouseLeave(object sender, MouseMoveEventArgs e)
{
hoverMoveIdx = -1;
base.onMouseLeave(sender, e);
}
}
}
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