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         [ClassInterface (ClassInterfaceType.AutoDispatch)]
  40         [ComVisible (true)]
  41         public class PrintPreviewControl : Control {
  42                 #region Local variables
  43                 bool autozoom;
  44                 int columns;
  45                 int rows;
  46                 int startPage;
  47                 double zoom;
  48                 int padding = ThemeEngine.Current.PrintPreviewControlPadding;
  49                 PrintDocument document;
  50                 internal PreviewPrintController controller;
  51                 internal PreviewPageInfo[] page_infos;
  52                 private VScrollBar vbar;
  53                 private HScrollBar hbar;
  54
  55                 internal Rectangle ViewPort;
  56                 internal Image[] image_cache;
  57                 Size image_size;
  58
  59                 #endregion // Local variables
  60
  61                 #region Public Constructors
  62                 public PrintPreviewControl() {
  63                         autozoom = true;
  64                         columns = 1;
  65                         rows = 0;
  66                         startPage = 1;
  67
  68                         this.BackColor = SystemColors.AppWorkspace;
  69
  70                         controller = new PreviewPrintController ();
  71
  72                         vbar = new ImplicitVScrollBar ();
  73                         hbar = new ImplicitHScrollBar ();
  74
  75                         vbar.Visible = false;
  76                         hbar.Visible = false;
  77                         vbar.ValueChanged += new EventHandler (VScrollBarValueChanged);
  78                         hbar.ValueChanged += new EventHandler (HScrollBarValueChanged);
  79
  80                         SuspendLayout ();
  81                         Controls.AddImplicit (vbar);
  82                         Controls.AddImplicit (hbar);
  83                         ResumeLayout ();
  84                 }
  85                 #endregion // Public Constructors
  86
  87
  88                 #region Public Instance Properties
  89                 [DefaultValue(true)]
  90                 public bool AutoZoom {
  91                         get { return autozoom; }
  92                         set {
  93                                 autozoom = value;
  94                                 InvalidateLayout ();
  95                         }
  96                 }
  97                 [DefaultValue(1)]
  98                 public int Columns {
  99                         get { return columns; }
 100                         set {
 101                                 columns = value;
 102                                 InvalidateLayout ();
 103                         }
 104                 }
 105                 [DefaultValue(null)]
 106                 public PrintDocument Document {
 107                         get { return document; }
 108                         set {
 109                                 document = value;
 110                         }
 111                 }
 112
 113                 [Localizable (true)]
 114                 [AmbientValue (RightToLeft.Inherit)]
 115                 public override RightToLeft RightToLeft {
 116                         get { return base.RightToLeft; }
 117                         set { base.RightToLeft = value; }
 118                 }
 119
 120                 [DefaultValue(1)]
 121                 public int Rows {
 122                         get { return rows; }
 123                         set {
 124                                 rows = value;
 125                                 InvalidateLayout ();
 126                         }
 127                 }
 128                 [DefaultValue(0)]
 129                 public int StartPage {
 130                         get { return startPage; }
 131                         set {
 132                                 if (value < 1)
 133                                         return;
 134                                 if (document != null && value + (Rows + 1) * Columns > page_infos.Length + 1) {
 135                                         value = page_infos.Length + 1 - (Rows + 1) * Columns;
 136                                         if (value < 1)
 137                                                 value = 1;
 138                                 }
 139
 140                                 int start = StartPage;
 141                                 startPage = value;
 142                                 if (start != startPage) {
 143                                         InvalidateLayout ();
 144                                         OnStartPageChanged (EventArgs.Empty);
 145                                 }
 146                         }
 147                 }
 148
 149                 [Bindable(false)]
 150                 [Browsable(false)]
 151                 [EditorBrowsable(EditorBrowsableState.Never)]
 152                 [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
 153                 public override string Text {
 154                         get { return base.Text; }
 155                         set { base.Text = value; }
 156                 }
 157
 158                 [DefaultValue(false)]
 159                 public bool UseAntiAlias {
 160                         get { return controller.UseAntiAlias; }
 161                         set { controller.UseAntiAlias = value; }
 162                 }
 163
 164                 [DefaultValue (0.3)]
 165                 public double Zoom {
 166                         get { return zoom; }
 167                         set {
 168                                 if (value <= 0)
 169                                         throw new ArgumentException ("zoom");
 170                                 autozoom = false;
 171                                 zoom = value;
 172                                 InvalidateLayout ();
 173                         }
 174                 }
 175                 #endregion // Public Instance Properties
 176
 177
 178                 #region Public Instance Methods
 179                 internal void GeneratePreview ()
 180                 {
 181                         if (document == null)
 182                                 return;
 183
 184                         try {
 185                                 if (page_infos == null) {
 186                                         if (document.PrintController == null || !(document.PrintController is PrintControllerWithStatusDialog)) {
 187                                                 document.PrintController = new PrintControllerWithStatusDialog (controller);
 188                                         }
 189                                         document.Print ();
 190                                         page_infos = controller.GetPreviewPageInfo ();
 191                                 }
 192
 193                                 if (image_cache == null) {
 194                                         image_cache = new Image[page_infos.Length];
 195
 196                                         if (page_infos.Length > 0) {
 197                                                 image_size = ThemeEngine.Current.PrintPreviewControlGetPageSize (this);
 198                                                 if (image_size.Width >= 0 && image_size.Width < page_infos[0].Image.Width
 199                                                     && image_size.Height >= 0 && image_size.Height < page_infos[0].Image.Height) {
 200
 201                                                         for (int i = 0; i < page_infos.Length; i ++) {
 202                                                                 image_cache[i] = new Bitmap (image_size.Width, image_size.Height);
 203                                                                 Graphics g = Graphics.FromImage (image_cache[i]);
 204                                                                 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);
 205                                                                 g.Dispose ();
 206                                                         }
 207                                                 }
 208                                         }
 209                                 }
 210                                 UpdateScrollBars();
 211                         }
 212                         catch (Exception e) {
 213                                 page_infos = new PreviewPageInfo[0];
 214                                 image_cache = new Image[0];
 215                                 MessageBox.Show (e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
 216                         }
 217                 }
 218
 219                 public void InvalidatePreview()
 220                 {
 221                         if (page_infos != null) {
 222                                 for (int i = 0; i < page_infos.Length; i++) {
 223                                         if (page_infos[i].Image != null) {
 224                                                 page_infos[i].Image.Dispose();
 225                                         }
 226                                 }
 227                                 page_infos = null;
 228                         }
 229                         InvalidateLayout();
 230                 }
 231
 232                 [EditorBrowsable(EditorBrowsableState.Never)]
 233                 public override void ResetBackColor()
 234                 {
 235                         base.ResetBackColor();
 236                 }
 237
 238                 [EditorBrowsable(EditorBrowsableState.Never)]
 239                 public override void ResetForeColor()
 240                 {
 241                         base.ResetForeColor ();
 242                 }
 243                 #endregion // Public Instance Methods
 244
 245                 #region Protected Instance Properties
 246                 protected override CreateParams CreateParams {
 247                         get {
 248                                 return base.CreateParams;
 249                         }
 250                 }
 251
 252                 #endregion // Protected Instance Methods
 253
 254                 #region Protected Instance Properties
 255
 256                 protected override void OnPaint(PaintEventArgs pevent)
 257                 {
 258                         if (page_infos == null || image_cache == null)
 259                                 GeneratePreview ();
 260                         ThemeEngine.Current.PrintPreviewControlPaint (pevent, this, image_size);
 261                 }
 262
 263                 protected override void OnResize(EventArgs eventargs)
 264                 {
 265                         InvalidateLayout ();
 266                         base.OnResize (eventargs);
 267                 }
 268
 269                 protected virtual void OnStartPageChanged(EventArgs e)
 270                 {
 271                         EventHandler eh = (EventHandler)(Events [StartPageChangedEvent]);
 272                         if (eh != null)
 273                                 eh (this, e);
 274                 }
 275
 276                 protected override void WndProc(ref Message m)
 277                 {
 278                         base.WndProc (ref m);
 279                 }
 280
 281                 #endregion // Protected Instance Methods
 282
 283                 static object StartPageChangedEvent = new object ();
 284
 285                 public event EventHandler StartPageChanged {
 286                         add { Events.AddHandler (StartPageChangedEvent, value); }
 287                         remove { Events.RemoveHandler (StartPageChangedEvent, value); }
 288                 }
 289
 290                 [Browsable(false)]
 291                 [EditorBrowsable(EditorBrowsableState.Never)]
 292                 public new event EventHandler TextChanged {
 293                         add { base.TextChanged += value; }
 294                         remove { base.TextChanged -= value; }
 295                 }
 296
 297                 internal int vbar_value;
 298                 internal int hbar_value;
 299
 300                 #region UIA Framework Property
 301                 internal ScrollBar UIAVScrollBar {
 302                         get { return vbar; }
 303                 }
 304
 305                 internal ScrollBar UIAHScrollBar {
 306                         get { return hbar; }
 307                 }
 308                 #endregion
 309
 310                 private void VScrollBarValueChanged (object sender, EventArgs e)
 311                 {
 312                         int pixels;
 313
 314                         if (vbar.Value > vbar_value)
 315                                 pixels = -1 * (vbar.Value - vbar_value);
 316                         else
 317                                 pixels = vbar_value - vbar.Value;
 318
 319                         vbar_value = vbar.Value;
 320                         XplatUI.ScrollWindow (Handle, ViewPort, 0, pixels, false);
 321                 }
 322
 323
 324                 private void HScrollBarValueChanged (object sender, EventArgs e)
 325                 {
 326                         int pixels;
 327
 328                         if (hbar.Value > hbar_value)
 329                                 pixels = -1 * (hbar.Value - hbar_value);
 330                         else
 331                                 pixels = hbar_value - hbar.Value;
 332
 333                         hbar_value = hbar.Value;
 334                         XplatUI.ScrollWindow (Handle, ViewPort, pixels, 0, false);
 335                 }
 336
 337                 private void UpdateScrollBars ()
 338                 {
 339                         ViewPort = ClientRectangle;
 340                         if (AutoZoom)
 341                                 return;
 342
 343                         int total_width, total_height;
 344
 345                         total_width = image_size.Width * Columns + (Columns + 1) * padding;
 346                         total_height = image_size.Height * (Rows + 1) + (Rows + 2) * padding;
 347
 348                         bool vert = false;
 349                         bool horz = false;
 350
 351                         if (total_width > ClientRectangle.Width) {
 352                                 /* we need the hbar */
 353                                 horz = true;
 354                                 ViewPort.Height -= hbar.Height;
 355                         }
 356                         if (total_height > ViewPort.Height) {
 357                                 /* we need the vbar */
 358                                 vert = true;
 359                                 ViewPort.Width -= vbar.Width;
 360                         }
 361                         if (!horz && total_width > ViewPort.Width) {
 362                                 horz = true;
 363                                 ViewPort.Height -= hbar.Height;
 364                         }
 365
 366                         SuspendLayout ();
 367
 368                         if (vert) {
 369                                 vbar.SetValues (total_height, ViewPort.Height);
 370
 371                                 vbar.Bounds = new Rectangle (ClientRectangle.Width - vbar.Width, 0, vbar.Width,
 372                                                              ClientRectangle.Height -
 373                                                              (horz ? SystemInformation.VerticalScrollBarWidth : 0));
 374                                 vbar.Visible = true;
 375                                 vbar_value = vbar.Value;
 376                         }
 377                         else {
 378                                 vbar.Visible = false;
 379                         }
 380
 381                         if (horz) {
 382                                 hbar.SetValues (total_width, ViewPort.Width);
 383
 384                                 hbar.Bounds = new Rectangle (0, ClientRectangle.Height - hbar.Height,
 385                                                              ClientRectangle.Width - (vert ?
 386                                                                                       SystemInformation.HorizontalScrollBarHeight : 0),
 387                                                              hbar.Height);
 388                                 hbar.Visible = true;
 389                                 hbar_value = hbar.Value;
 390                         }
 391                         else {
 392                                 hbar.Visible = false;
 393                         }
 394
 395                         ResumeLayout (false);
 396                 }
 397
 398                 private void InvalidateLayout() {
 399                         if (image_cache != null) {
 400                                 for (int i = 0; i < image_cache.Length; i++) {
 401                                         if (image_cache[i] !=null)
 402                                                 image_cache[i].Dispose();
 403                                 }
 404                                 image_cache = null;
 405                         }
 406                         Invalidate ();
 407                 }
 408         }
 409 }