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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2024 Dominik Reichl <dominik.reichl@t-online.de>
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Reflection;
using System.Text;
using System.Windows.Forms;
using KeePassLib.Native;
namespace KeePass.UI
{
public sealed class CustomSplitContainerEx : SplitContainer
{
private ControlCollection m_ccControls = null;
private Control m_cDefault = null;
private Control m_cFocused = null;
private Control m_cLastKnown = null;
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public double SplitterDistanceFrac
{
get
{
bool bVert = (this.Orientation == Orientation.Vertical);
int m = (bVert ? this.Width : this.Height);
if(m <= 0) { Debug.Assert(false); return 0.0; }
int d = this.SplitterDistance;
if(d < 0) { Debug.Assert(false); return 0.0; }
if(d == 0) return 0.0; // Avoid fExact infinity
double f = (double)d / (double)m;
try
{
FieldInfo fi = GetRatioField(bVert);
if(fi != null)
{
double fExact = (double)fi.GetValue(this);
if(fExact > double.Epsilon)
{
fExact = 1.0 / fExact;
// Test whether fExact makes sense and if so,
// use it instead of f; 1/m as boundary is
// slightly too strict
if(Math.Abs(fExact - f) <= (1.5 / (double)m))
return fExact;
else { Debug.Assert(false); }
}
else { Debug.Assert(false); }
}
else { Debug.Assert(false); }
}
catch(Exception) { Debug.Assert(false); }
return f;
}
set
{
if((value < 0.0) || (value > 1.0)) { Debug.Assert(false); return; }
bool bVert = (this.Orientation == Orientation.Vertical);
int m = (bVert ? this.Width : this.Height);
if(m <= 0) { Debug.Assert(false); return; }
int d = (int)Math.Round(value * (double)m);
if(d < 0) { Debug.Assert(false); d = 0; }
if(d > m) { Debug.Assert(false); d = m; }
this.SplitterDistance = d;
if(d == 0) return; // Avoid infinity / division by zero
// If the position was auto-adjusted (e.g. due to
// minimum size constraints), skip the rest
if(this.SplitterDistance != d) return;
try
{
FieldInfo fi = GetRatioField(bVert);
if(fi != null)
{
double fEst = (double)fi.GetValue(this);
if(fEst <= double.Epsilon) { Debug.Assert(false); return; }
fEst = 1.0 / fEst; // m/d -> d/m
// Test whether fEst makes sense and if so,
// overwrite it with the exact value;
// we must test for 1.5/m, not 1/m, because .NET
// uses Math.Floor and we use Math.Round
if(Math.Abs(fEst - value) <= (1.5 / (double)m))
fi.SetValue(this, 1.0 / value); // d/m -> m/d
else { Debug.Assert(false); }
}
else { Debug.Assert(false); }
}
catch(Exception) { Debug.Assert(false); }
}
}
public bool ShouldSerializeSplitterDistanceFrac() { return false; }
public CustomSplitContainerEx() : base()
{
// if(Program.DesignMode) return;
}
public void InitEx(ControlCollection cc, Control cDefault)
{
m_ccControls = cc;
m_cDefault = m_cLastKnown = cDefault;
}
private static Control FindInputFocus(ControlCollection cc)
{
if(cc == null) { Debug.Assert(false); return null; }
foreach(Control c in cc)
{
if(c.Focused)
return c;
else if(c.ContainsFocus)
return FindInputFocus(c.Controls);
}
return null;
}
protected override void OnMouseDown(MouseEventArgs e)
{
m_cFocused = FindInputFocus(m_ccControls);
if(m_cFocused == null) m_cFocused = m_cDefault;
if(m_cFocused != null) m_cLastKnown = m_cFocused;
base.OnMouseDown(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
if(m_cFocused != null)
{
UIUtil.SetFocus(m_cFocused, null);
m_cFocused = null;
}
else { Debug.Assert(false); }
}
protected override void OnEnter(EventArgs e)
{
base.OnEnter(e);
if(this.Focused && (m_cFocused == null))
{
if(m_cLastKnown != null) UIUtil.SetFocus(m_cLastKnown, null);
else if(m_cDefault != null) UIUtil.SetFocus(m_cDefault, null);
}
}
private static FieldInfo GetRatioField(bool bVert)
{
// Both .NET and Mono store 'max/pos', not 'pos/max'
return typeof(SplitContainer).GetField(
(NativeLib.IsUnix() ? "fixed_none_ratio" :
(bVert ? "ratioWidth" : "ratioHeight")),
(BindingFlags.Instance | BindingFlags.NonPublic));
}
}
}
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