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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace gsview
{
/// <summary>
/// Interaction logic for Selection.xaml
/// </summary>
///
public enum SelectStatus_t
{
OK,
CANCEL,
SELECT,
CLOSE,
ZOOMIN,
ZOOMOUT
}
public class SelectEventArgs : EventArgs
{
Point m_topleft, m_size;
double m_zoomFactor;
SelectStatus_t m_state;
int m_page_num;
Extract_Type_t m_type;
public Point TopLeft
{
get { return m_topleft; }
}
public Point Size
{
get { return m_size; }
}
public double ZoomFactor
{
get { return m_zoomFactor; }
}
public int PageNum
{
get { return m_page_num; }
}
public SelectStatus_t State
{
get { return m_state; }
}
public Extract_Type_t Type
{
get { return m_type; }
}
public SelectEventArgs(Point start, Point size, double zoom,
SelectStatus_t state, int page, Extract_Type_t type)
{
m_topleft = start;
m_size = size;
m_zoomFactor = zoom;
m_state = state;
m_page_num = page;
m_type = type;
}
}
public partial class Selection : Window
{
private Point m_startPoint, m_topleft;
private Point m_size;
public SelectStatus_t m_curr_state;
double m_zoom;
double m_old_zoom;
int m_page_num;
private Rectangle m_rect;
Extract_Type_t m_type;
internal delegate void CallBackMain(object gsObject, SelectEventArgs info);
internal event CallBackMain UpdateMain;
public Selection(int page, double init_zoom, Extract_Type_t type)
{
InitializeComponent();
this.Closing += new System.ComponentModel.CancelEventHandler(WindowClosing);
m_page_num = page;
m_zoom = init_zoom;
m_curr_state = SelectStatus_t.OK;
m_type = type;
m_rect = null;
}
void WindowClosing(object sender, System.ComponentModel.CancelEventArgs e)
{
var result = new SelectEventArgs(m_topleft, m_size, m_zoom,
SelectStatus_t.CANCEL, m_page_num, m_type);
UpdateMain(this, result);
}
private void ClickOK(object sender, RoutedEventArgs e)
{
if (m_curr_state != SelectStatus_t.OK)
return;
if (m_rect == null)
Close();
else
{
m_size.X = m_rect.Width;
m_size.Y = m_rect.Height;
m_topleft.Y = xaml_Image.Height - m_topleft.Y - m_size.Y;
var result = new SelectEventArgs(m_topleft, m_size, m_zoom,
SelectStatus_t.SELECT, m_page_num, m_type);
UpdateMain(this, result);
}
}
private void ClickExit(object sender, RoutedEventArgs e)
{
var result = new SelectEventArgs(m_topleft, m_size, m_zoom,
SelectStatus_t.CANCEL, m_page_num, m_type);
UpdateMain(this, result);
Close();
}
private void ClickClear(object sender, RoutedEventArgs e)
{
if (m_rect != null)
{
xaml_Canvas.Children.Remove(m_rect);
m_rect = null;
}
}
private void ZoomIn(object sender, RoutedEventArgs e)
{
if (m_curr_state != SelectStatus_t.OK || m_zoom >= Constants.ZOOM_MAX)
return;
m_old_zoom = m_zoom;
m_zoom = m_zoom + Constants.ZOOM_STEP;
if (m_zoom > Constants.ZOOM_MAX)
{
m_zoom = Constants.ZOOM_MAX;
return;
}
m_curr_state = SelectStatus_t.ZOOMIN;
var result = new SelectEventArgs(m_startPoint, m_size, m_zoom,
SelectStatus_t.ZOOMIN, m_page_num, m_type);
UpdateMain(this, result);
}
private void ZoomOut(object sender, RoutedEventArgs e)
{
if (m_curr_state != SelectStatus_t.OK || m_zoom <= Constants.ZOOM_MIN)
return;
m_old_zoom = m_zoom;
m_zoom = m_zoom - Constants.ZOOM_STEP;
if (m_zoom < Constants.ZOOM_MIN)
{
m_zoom = Constants.ZOOM_MIN;
return;
}
m_curr_state = SelectStatus_t.ZOOMOUT;
var result = new SelectEventArgs(m_startPoint, m_size, m_zoom,
SelectStatus_t.ZOOMOUT, m_page_num, m_type);
UpdateMain(this, result);
}
/* Called when we have had a zoom change */
public void UpdateRect()
{
if (m_rect != null)
{
double left = Canvas.GetLeft(m_rect);
double top = Canvas.GetTop(m_rect);
Canvas.SetLeft(m_rect, left * m_zoom / m_old_zoom);
Canvas.SetTop(m_rect, top * m_zoom / m_old_zoom);
m_rect.Width = m_rect.Width * m_zoom / m_old_zoom;
m_rect.Height = m_rect.Height * m_zoom / m_old_zoom;
}
}
private void Canvas_MouseDown(object sender, MouseButtonEventArgs e)
{
if (m_rect != null)
{
xaml_Canvas.Children.Remove(m_rect);
}
m_startPoint = e.GetPosition(xaml_Canvas);
m_rect = new Rectangle
{
Stroke = Brushes.Red,
StrokeThickness = 2
};
Canvas.SetLeft(m_rect, m_startPoint.X);
Canvas.SetTop(m_rect, m_startPoint.X);
xaml_Canvas.Children.Add(m_rect);
}
private void Canvas_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Released || m_rect == null)
return;
var pos = e.GetPosition(xaml_Canvas);
var x = Math.Min(pos.X, m_startPoint.X);
var y = Math.Min(pos.Y, m_startPoint.Y);
var w = Math.Max(pos.X, m_startPoint.X) - x;
var h = Math.Max(pos.Y, m_startPoint.Y) - y;
m_rect.Width = w;
m_rect.Height = h;
m_topleft.X = x;
m_topleft.Y = y;
Canvas.SetLeft(m_rect, x);
Canvas.SetTop(m_rect, y);
}
}
}
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