mcs/class/Managed.Windows.Forms/System.Windows.Forms/PrintPreviewControl.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2006 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jonathan Chambers (jonathan.chambers@ansys.com)
  24 //
  25
  26 using System;
  27 using System.ComponentModel;
  28 using System.ComponentModel.Design;
  29 using System.ComponentModel.Design.Serialization;
  30 using System.Collections;
  31 using System.Diagnostics;
  32 using System.Drawing;
  33 using System.Drawing.Printing;
  34 using System.Reflection;
  35 using System.Runtime.InteropServices;
  36
  37 namespace System.Windows.Forms {
  38         [DefaultPropertyAttribute("Document")]
  39 #if NET_2_0
  40         [ClassInterface (ClassInterfaceType.AutoDispatch)]
  41         [ComVisible (true)]
  42 #endif
  43         public class PrintPreviewControl : Control {
  44                 #region Local variables
  45                 bool autozoom;
  46                 int columns;
  47                 int rows;
  48                 int startPage;
  49                 double zoom;
  50                 int padding = ThemeEngine.Current.PrintPreviewControlPadding;
  51                 PrintDocument document;
  52                 internal PreviewPrintController controller;
  53                 internal PreviewPageInfo[] page_infos;
  54                 private VScrollBar vbar;
  55                 private HScrollBar hbar;
  56
  57                 internal Rectangle ViewPort;
  58                 internal Image[] image_cache;
  59                 Size image_size;
  60
  61                 #endregion // Local variables
  62
  63                 #region Public Constructors
  64                 public PrintPreviewControl() {
  65                         autozoom = true;
  66                         columns = 1;
  67                         rows = 0;
  68                         startPage = 1;
  69
  70                         this.BackColor = SystemColors.AppWorkspace;
  71
  72                         controller = new PreviewPrintController ();
  73
  74                         vbar = new ImplicitVScrollBar ();
  75                         hbar = new ImplicitHScrollBar ();
  76
  77                         vbar.Visible = false;
  78                         hbar.Visible = false;
  79                         vbar.ValueChanged += new EventHandler (VScrollBarValueChanged);
  80                         hbar.ValueChanged += new EventHandler (HScrollBarValueChanged);
  81
  82                         SuspendLayout ();
  83                         Controls.AddImplicit (vbar);
  84                         Controls.AddImplicit (hbar);
  85                         ResumeLayout ();
  86                 }
  87                 #endregion // Public Constructors
  88
  89
  90                 #region Public Instance Properties
  91                 [DefaultValue(true)]
  92                 public bool AutoZoom {
  93                         get { return autozoom; }
  94                         set {
  95                                 autozoom = value;
  96                                 InvalidateLayout ();
  97                         }
  98                 }
  99                 [DefaultValue(1)]
 100                 public int Columns {
 101                         get { return columns; }
 102                         set {
 103                                 columns = value;
 104                                 InvalidateLayout ();
 105                         }
 106                 }
 107                 [DefaultValue(null)]
 108                 public PrintDocument Document {
 109                         get { return document; }
 110                         set {
 111                                 document = value;
 112                         }
 113                 }
 114
 115 #if NET_2_0
 116                 [Localizable (true)]
 117                 [AmbientValue (RightToLeft.Inherit)]
 118                 public override RightToLeft RightToLeft {
 119                         get { return base.RightToLeft; }
 120                         set { base.RightToLeft = value; }
 121                 }
 122 #endif
 123
 124                 [DefaultValue(1)]
 125                 public int Rows {
 126                         get { return rows; }
 127                         set {
 128                                 rows = value;
 129                                 InvalidateLayout ();
 130                         }
 131                 }
 132                 [DefaultValue(0)]
 133                 public int StartPage {
 134                         get { return startPage; }
 135                         set {
 136                                 if (value < 1)
 137                                         return;
 138                                 if (document != null && value + (Rows + 1) * Columns > page_infos.Length + 1) {
 139                                         value = page_infos.Length + 1 - (Rows + 1) * Columns;
 140                                         if (value < 1)
 141                                                 value = 1;
 142                                 }
 143
 144                                 int start = StartPage;
 145                                 startPage = value;
 146                                 if (start != startPage) {
 147                                         InvalidateLayout ();
 148                                         OnStartPageChanged (EventArgs.Empty);
 149                                 }
 150                         }
 151                 }
 152
 153                 [Bindable(false)]
 154                 [Browsable(false)]
 155                 [EditorBrowsable(EditorBrowsableState.Never)]
 156                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 157                 public override string Text {
 158                         get { return base.Text; }
 159                         set { base.Text = value; }
 160                 }
 161
 162                 [DefaultValue(false)]
 163                 public bool UseAntiAlias {
 164                         get { return controller.UseAntiAlias; }
 165                         set { controller.UseAntiAlias = value; }
 166                 }
 167
 168 #if NET_2_0
 169                 [DefaultValue (0.3)]
 170 #endif
 171                 public double Zoom {
 172                         get { return zoom; }
 173                         set {
 174                                 if (value <= 0)
 175                                         throw new ArgumentException ("zoom");
 176                                 autozoom = false;
 177                                 zoom = value;
 178                                 InvalidateLayout ();
 179                         }
 180                 }
 181                 #endregion // Public Instance Properties
 182
 183
 184                 #region Public Instance Methods
 185                 internal void GeneratePreview ()
 186                 {
 187                         if (document == null)
 188                                 return;
 189
 190                         try {
 191                                 if (page_infos == null) {
 192                                         if (document.PrintController == null || !(document.PrintController is PrintControllerWithStatusDialog)) {
 193                                                 document.PrintController = new PrintControllerWithStatusDialog (controller);
 194                                         }
 195                                         document.Print ();
 196                                         page_infos = controller.GetPreviewPageInfo ();
 197                                 }
 198
 199                                 if (image_cache == null) {
 200                                         image_cache = new Image[page_infos.Length];
 201
 202                                         if (page_infos.Length > 0) {
 203                                                 image_size = ThemeEngine.Current.PrintPreviewControlGetPageSize (this);
 204                                                 if (image_size.Width >= 0 && image_size.Width < page_infos[0].Image.Width
 205                                                     && image_size.Height >= 0 && image_size.Height < page_infos[0].Image.Height) {
 206
 207                                                         for (int i = 0; i < page_infos.Length; i ++) {
 208                                                                 image_cache[i] = new Bitmap (image_size.Width, image_size.Height);
 209                                                                 Graphics g = Graphics.FromImage (image_cache[i]);
 210                                                                 g.DrawImage (page_infos[i].Image, new Rectangle (new Point (0, 0), image_size), 0, 0, page_infos[i].Image.Width, page_infos[i].Image.Height, GraphicsUnit.Pixel);
 211                                                                 g.Dispose ();
 212                                                         }
 213                                                 }
 214                                         }
 215                                 }
 216                                 UpdateScrollBars();
 217                         }
 218                         catch (Exception e) {
 219                                 page_infos = new PreviewPageInfo[0];
 220                                 image_cache = new Image[0];
 221                                 MessageBox.Show (e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
 222                         }
 223                 }
 224
 225                 public void InvalidatePreview()
 226                 {
 227                         if (page_infos != null) {
 228                                 for (int i = 0; i < page_infos.Length; i++) {
 229                                         if (page_infos[i].Image != null) {
 230                                                 page_infos[i].Image.Dispose();
 231                                         }
 232                                 }
 233                                 page_infos = null;
 234                         }
 235                         InvalidateLayout();
 236                 }
 237
 238                 [EditorBrowsable(EditorBrowsableState.Never)]
 239                 public override void ResetBackColor()
 240                 {
 241                         base.ResetBackColor();
 242                 }
 243
 244                 [EditorBrowsable(EditorBrowsableState.Never)]
 245                 public override void ResetForeColor()
 246                 {
 247                         base.ResetForeColor ();
 248                 }
 249                 #endregion // Public Instance Methods
 250
 251                 #region Protected Instance Properties
 252                 protected override CreateParams CreateParams {
 253                         get {
 254                                 return base.CreateParams;
 255                         }
 256                 }
 257
 258                 #endregion // Protected Instance Methods
 259
 260                 #region Protected Instance Properties
 261
 262                 protected override void OnPaint(PaintEventArgs pevent)
 263                 {
 264                         if (page_infos == null || image_cache == null)
 265                                 GeneratePreview ();
 266                         ThemeEngine.Current.PrintPreviewControlPaint (pevent, this, image_size);
 267                 }
 268
 269                 protected override void OnResize(EventArgs eventargs)
 270                 {
 271                         InvalidateLayout ();
 272                         base.OnResize (eventargs);
 273                 }
 274
 275                 protected virtual void OnStartPageChanged(EventArgs e)
 276                 {
 277                         EventHandler eh = (EventHandler)(Events [StartPageChangedEvent]);
 278                         if (eh != null)
 279                                 eh (this, e);
 280                 }
 281
 282                 protected override void WndProc(ref Message m)
 283                 {
 284                         base.WndProc (ref m);
 285                 }
 286
 287                 #endregion // Protected Instance Methods
 288
 289                 static object StartPageChangedEvent = new object ();
 290
 291                 public event EventHandler StartPageChanged {
 292                         add { Events.AddHandler (StartPageChangedEvent, value); }
 293                         remove { Events.RemoveHandler (StartPageChangedEvent, value); }
 294                 }
 295
 296                 [Browsable(false)]
 297                 [EditorBrowsable(EditorBrowsableState.Never)]
 298                 public new event EventHandler TextChanged {
 299                         add { base.TextChanged += value; }
 300                         remove { base.TextChanged -= value; }
 301                 }
 302
 303                 internal int vbar_value;
 304                 internal int hbar_value;
 305
 306                 #region UIA Framework Property
 307 #if NET_2_0
 308                 internal ScrollBar UIAVScrollBar {
 309                         get { return vbar; }
 310                 }
 311
 312                 internal ScrollBar UIAHScrollBar {
 313                         get { return hbar; }
 314                 }
 315 #endif
 316                 #endregion
 317
 318                 private void VScrollBarValueChanged (object sender, EventArgs e)
 319                 {
 320                         int pixels;
 321
 322                         if (vbar.Value > vbar_value)
 323                                 pixels = -1 * (vbar.Value - vbar_value);
 324                         else
 325                                 pixels = vbar_value - vbar.Value;
 326
 327                         vbar_value = vbar.Value;
 328                         XplatUI.ScrollWindow (Handle, ViewPort, 0, pixels, false);
 329                 }
 330
 331
 332                 private void HScrollBarValueChanged (object sender, EventArgs e)
 333                 {
 334                         int pixels;
 335
 336                         if (hbar.Value > hbar_value)
 337                                 pixels = -1 * (hbar.Value - hbar_value);
 338                         else
 339                                 pixels = hbar_value - hbar.Value;
 340
 341                         hbar_value = hbar.Value;
 342                         XplatUI.ScrollWindow (Handle, ViewPort, pixels, 0, false);
 343                 }
 344
 345                 private void UpdateScrollBars ()
 346                 {
 347                         ViewPort = ClientRectangle;
 348                         if (AutoZoom)
 349                                 return;
 350
 351                         int total_width, total_height;
 352
 353                         total_width = image_size.Width * Columns + (Columns + 1) * padding;
 354                         total_height = image_size.Height * (Rows + 1) + (Rows + 2) * padding;
 355
 356                         bool vert = false;
 357                         bool horz = false;
 358
 359                         if (total_width > ClientRectangle.Width) {
 360                                 /* we need the hbar */
 361                                 horz = true;
 362                                 ViewPort.Height -= hbar.Height;
 363                         }
 364                         if (total_height > ViewPort.Height) {
 365                                 /* we need the vbar */
 366                                 vert = true;
 367                                 ViewPort.Width -= vbar.Width;
 368                         }
 369                         if (!horz && total_width > ViewPort.Width) {
 370                                 horz = true;
 371                                 ViewPort.Height -= hbar.Height;
 372                         }
 373
 374                         SuspendLayout ();
 375
 376                         if (vert) {
 377                                 vbar.SetValues (total_height, ViewPort.Height);
 378
 379                                 vbar.Bounds = new Rectangle (ClientRectangle.Width - vbar.Width, 0, vbar.Width,
 380                                                              ClientRectangle.Height -
 381                                                              (horz ? SystemInformation.VerticalScrollBarWidth : 0));
 382                                 vbar.Visible = true;
 383                                 vbar_value = vbar.Value;
 384                         }
 385                         else {
 386                                 vbar.Visible = false;
 387                         }
 388
 389                         if (horz) {
 390                                 hbar.SetValues (total_width, ViewPort.Width);
 391
 392                                 hbar.Bounds = new Rectangle (0, ClientRectangle.Height - hbar.Height,
 393                                                              ClientRectangle.Width - (vert ?
 394                                                                                       SystemInformation.HorizontalScrollBarHeight : 0),
 395                                                              hbar.Height);
 396                                 hbar.Visible = true;
 397                                 hbar_value = hbar.Value;
 398                         }
 399                         else {
 400                                 hbar.Visible = false;
 401                         }
 402
 403                         ResumeLayout (false);
 404                 }
 405
 406                 private void InvalidateLayout() {
 407                         if (image_cache != null) {
 408                                 for (int i = 0; i < image_cache.Length; i++) {
 409                                         if (image_cache[i] !=null)
 410                                                 image_cache[i].Dispose();
 411                                 }
 412                                 image_cache = null;
 413                         }
 414                         Invalidate ();
 415                 }
 416         }
 417 }