BeginUpdate Method

Summary
Stops the viewer from being refreshed if changes are applied. This is useful to increase the control speed efficiency.
Syntax
C#
C++/CLI
public void BeginUpdate() 
            public: 
void BeginUpdate();  
Remarks

This method will cause the viewer not to repaint if changes are applied. When the user calls the EndUpdate method, the viewer will repaint to show all the changes made. This is useful for better visual results and for speed efficiency.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.MedicalViewer; 
 
class MedicalViewerForm : Form 
{ 
   private MedicalViewer _medicalViewer; 
   private Button applyEffects; 
 
   void MedicalViewerForm_SizeChanged(object sender, EventArgs e) 
   { 
      _medicalViewer.Size = new Size(this.ClientRectangle.Right - 30, this.ClientRectangle.Bottom); 
   } 
 
   public MedicalViewerForm() 
   { 
      RasterCodecs _codecs = new RasterCodecs(); 
      RasterImage _image; 
 
      this.SizeChanged += new EventHandler(MedicalViewerForm_SizeChanged); 
 
      // Create the medical viewer and adjust the size and the location. 
      _medicalViewer = new MedicalViewer(1, 2); 
      _medicalViewer.Location = new Point(30, 0); 
      _medicalViewer.Size = new Size(this.ClientRectangle.Right - 30, this.ClientRectangle.Bottom); 
 
      // Load an image and then add it to the control. 
      _image = _codecs.Load(Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm")); 
      MedicalViewerMultiCell cell = new MedicalViewerMultiCell(_image, true, 1, 1); 
      _medicalViewer.Cells.Add(cell); 
 
      // add some actions that will be used to change the properties of the images inside the control. 
      cell.AddAction(MedicalViewerActionType.WindowLevel); 
      cell.AddAction(MedicalViewerActionType.Alpha); 
      cell.AddAction(MedicalViewerActionType.Offset); 
 
      // assign the added actions to a mouse button, meaning that when the user clicks and drags the mouse button, the associated action will be activated. 
      cell.SetAction(MedicalViewerActionType.WindowLevel, MedicalViewerMouseButtons.Left, MedicalViewerActionFlags.Active); 
      cell.SetAction(MedicalViewerActionType.Alpha, MedicalViewerMouseButtons.Middle, MedicalViewerActionFlags.Active); 
      cell.SetAction(MedicalViewerActionType.Offset, MedicalViewerMouseButtons.Right, MedicalViewerActionFlags.Active); 
 
      // adjust some properties of the cell and add some tags. 
      _medicalViewer.Cells[0].SetTag(2, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "EX. ID 230-36-5448"); 
      _medicalViewer.Cells[0].SetTag(4, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Frame); 
      _medicalViewer.Cells[0].SetTag(6, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Scale); 
      _medicalViewer.Cells[0].SetTag(2, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.WindowLevelData); 
      _medicalViewer.Cells[0].SetTag(1, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.FieldOfView); 
 
      // Load another image and then add it to the control. 
      _image = _codecs.Load(Path.Combine(LEAD_VARS.ImagesDir,"mr.dcm")); 
      _medicalViewer.Cells.Add(new MedicalViewerMultiCell(_image, true, 2, 2)); 
 
      // adjust some properties of the cell and add some tags. 
      _medicalViewer.Cells[1].SetTag(2, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "EX. ID 230-36-5448"); 
      _medicalViewer.Cells[1].SetTag(4, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Frame); 
      _medicalViewer.Cells[1].SetTag(6, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Scale); 
      _medicalViewer.Cells[1].SetTag(2, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.WindowLevelData); 
      _medicalViewer.Cells[1].SetTag(1, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.FieldOfView); 
 
 
      applyEffects = new Button(); 
      applyEffects.Location = new Point(0, 0); 
      applyEffects.Size = new Size(30, 15); 
      applyEffects.Text = "Apply Effects"; 
      applyEffects.Click += new EventHandler(applyEffects_Click); 
 
      Controls.Add(_medicalViewer); 
      _medicalViewer.Dock = DockStyle.Fill; 
      Controls.Add(applyEffects); 
   } 
 
   void applyEffects_Click(object sender, EventArgs e) 
   { 
      MedicalViewer medicalViewer = (MedicalViewer)_medicalViewer; 
      MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(medicalViewer.Cells[0]); 
      MedicalViewerMultiCell cell1 = (MedicalViewerMultiCell)(medicalViewer.Cells[1]); 
 
      DialogResult result = MessageBox.Show(@"This demo will do some effects on the Medical viewer, Do you want to use the begin and update update?", "Begin Update And End Update Demo", MessageBoxButtons.YesNo); 
 
      if (result == DialogResult.Yes) 
         medicalViewer.BeginUpdate(); 
 
      cell.SetTag( 8, 0,  MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "Sub Cell Tag 1"); 
      cell.SetTag( 0, 8,  MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "Sub Cell Tag 2"); 
      cell1.SetTag( 1, 9,  MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "Sub Cell Tag 3"); 
      cell1.SetTag( 2, 10, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "Sub Cell Tag 4"); 
      cell1.SetTag( 3, 11, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "Sub Cell Tag 5"); 
 
      cell.Rows = 3; 
      cell.Columns = 3; 
      cell.FitImageToCell = false; 
 
 
 
      MedicalViewerTagInformation tagInformation = new MedicalViewerTagInformation(); 
 
      tagInformation.Alignment = MedicalViewerTagAlignment.BottomLeft; 
      tagInformation.Position = 3; 
      tagInformation.Text = "Edit Text 1"; 
 
 
      cell.EditTag(8, 0, MedicalViewerTagAlignment.TopLeft, tagInformation); 
 
 
      tagInformation = new MedicalViewerTagInformation(); 
      tagInformation.Type = MedicalViewerTagType.Scale; 
 
      cell.EditTag(8, 0, MedicalViewerTagAlignment.BottomLeft, tagInformation); 
 
 
      cell.DeleteTag(0, 8, MedicalViewerTagAlignment.TopLeft); 
 
      // Shift the second row, one row down 
      tagInformation = cell.GetTag(2, 10, MedicalViewerTagAlignment.TopLeft); 
             
      tagInformation.Position += 1; 
 
      cell.EditTag(2, 10, MedicalViewerTagAlignment.TopLeft, tagInformation); 
 
      // Shift the second row, one row down 
      tagInformation = cell.GetTag(2, MedicalViewerTagAlignment.TopLeft); 
 
      tagInformation.Text = "Edited sub-cell Tag1"; 
      cell.EditTag(2, MedicalViewerTagAlignment.TopLeft, tagInformation); 
 
      cell.DeleteTag(4, MedicalViewerTagAlignment.TopLeft); 
 
      MedicalViewerWindowLevel windowLevelProperties = (MedicalViewerWindowLevel)cell.GetActionProperties(MedicalViewerActionType.WindowLevel, 0); 
 
      windowLevelProperties.Width = 20; 
      windowLevelProperties.Center = 50; 
 
      cell.SetActionProperties(MedicalViewerActionType.WindowLevel, windowLevelProperties); 
 
 
      double scale = cell.GetScale(0); 
 
      scale *= 2; 
 
      cell.SetScale(-1, scale); 
 
      cell1.SetScale(0, scale); 
 
      MedicalViewerScaleMode scaleMode = cell.GetScaleMode(0); 
 
      if (scaleMode == MedicalViewerScaleMode.Normal) 
         scaleMode = MedicalViewerScaleMode.Fit; 
      else 
         scaleMode = MedicalViewerScaleMode.Normal; 
 
      cell.SetScaleMode(scaleMode); 
 
      if (result == DialogResult.Yes) 
         medicalViewer.EndUpdate(); 
 
   } 
 
   public MedicalViewer Viewer 
   { 
      get { return _medicalViewer; } 
   } 
} 
 
MedicalViewerForm GetMedicalControl() 
{ 
   return new MedicalViewerForm(); 
} 
 
// This example creates a medical viewer control and two cells. when you click on the button it will ask you whether to apply some effects on the cell with or without using BeginUpdate/EndUpdate. Run this sample twice and see the difference 
public void MedicalViewerTagInformationExample() 
{ 
   MedicalViewerForm myForm = GetMedicalControl(); 
   MedicalViewer medicalViewer = myForm.Viewer; 
 
   myForm.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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Leadtools.MedicalViewer Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.