mcs/class/Managed.Windows.Forms/Test/System.Windows.Forms/DataGridViewRowHeightInfoNeededEventArgsTests.cs

   1 // Copyright (c) 2014 SIL International
   2 // This software is licensed under the MIT License (http://opensource.org/licenses/MIT)
   3 using System;
   4 using System.Windows.Forms;
   5 using NUnit.Framework;
   6 using CategoryAttribute = NUnit.Framework.CategoryAttribute;
   7
   8 namespace MonoTests.System.Windows.Forms
   9 {
  10         [TestFixture]
  11         public class DataGridViewRowHeightInfoNeededEventArgsTests
  12         {
  13                 struct RowInfo
  14                 {
  15                         public RowInfo (DataGridViewRowHeightInfoNeededEventArgs e)
  16                         {
  17                                 Height = e.Height;
  18                                 MinimumHeight = e.MinimumHeight;
  19                         }
  20
  21                         public int Height;
  22                         public int MinimumHeight;
  23                 }
  24
  25                 class DummyDataGridView : DataGridView
  26                 {
  27                         public RowInfo RowInfo;
  28
  29                         protected override void OnRowHeightInfoNeeded (DataGridViewRowHeightInfoNeededEventArgs e)
  30                         {
  31                                 base.OnRowHeightInfoNeeded (e);
  32                                 RowInfo = new RowInfo (e);
  33                         }
  34                 }
  35
  36                 [Test]
  37                 [Category("NotWorking")]
  38                 public void HeightCantBeLessThanCurrentMinimumHeight ()
  39                 {
  40                         using (var dgv = new DummyDataGridView ()) {
  41                                 // Setup
  42                                 dgv.VirtualMode = true;
  43                                 dgv.RowCount = 1;
  44                                 dgv.Rows [0].MinimumHeight = 5;
  45                                 dgv.Rows [0].Height = 10;
  46                                 dgv.RowHeightInfoNeeded += (sender, e) => {
  47                                         e.Height = 2;
  48                                         e.MinimumHeight = 2;
  49                                 };
  50                                 dgv.UpdateRowHeightInfo (0, false);
  51
  52                                 // Execute - this triggers the RowHeightInfoNeeded event
  53                                 // This test doesn't work because of different implementation details in .NET
  54                                 // and Mono: on .NET RowHeightInfoNeeded gets called for the first time when
  55                                 // executing the following line. In Mono RowHeightInfoNeeded got already called
  56                                 // while executing dgv.UpdateRowHeightInfo. This means that when RowHeightInfoNeeded
  57                                 // gets called now MinimumHeight is already set to 2, allowing Height to become
  58                                 // 2 as well.
  59                                 // On .NET since it is the first time Height will be set to 5 (the current
  60                                 // MinimumHeight value).
  61                                 // The .NET behaviour is surprising since the order of setting the information
  62                                 // in RowHeightInfoNeeded shouldn't matter, therefore I don't think it's worth
  63                                 // changing the behaviour in Mono. Even more so since there is an easy
  64                                 // workaround: simply swapping the two lines in the RowHeighInfoNeeded event
  65                                 // handler works around the problem.
  66                                 var dummy = dgv.Rows [0].Height;
  67
  68                                 // Verify
  69                                 var rowHeightInfo = dgv.RowInfo;
  70                                 Assert.AreEqual (5, rowHeightInfo.Height, "#A1"); // 5 because of buggy .NET behaviour
  71                                 Assert.AreEqual (2, rowHeightInfo.MinimumHeight, "#A2");
  72                         }
  73                 }
  74
  75                 [Test]
  76                 public void SettingHeightAfterChangingMinimumHeight ()
  77                 {
  78                         using (var dgv = new DummyDataGridView ()) {
  79                                 // Setup
  80                                 dgv.VirtualMode = true;
  81                                 dgv.RowCount = 1;
  82                                 dgv.Rows [0].MinimumHeight = 5;
  83                                 dgv.Rows [0].Height = 10;
  84                                 dgv.RowHeightInfoNeeded += (sender, e) => {
  85                                         e.MinimumHeight = 2;
  86                                         e.Height = 2;
  87                                 };
  88                                 dgv.UpdateRowHeightInfo (0, false);
  89
  90                                 // Execute - this triggers the RowHeightInfoNeeded event
  91                                 var dummy = dgv.Rows [0].Height;
  92
  93                                 // Verify
  94                                 var rowHeightInfo = dgv.RowInfo;
  95                                 Assert.AreEqual (2, rowHeightInfo.Height, "#B1");
  96                                 Assert.AreEqual (2, rowHeightInfo.MinimumHeight, "#B2");
  97                         }
  98                 }
  99         }
 100 }
 101