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POHow to make VirtualStringTree scrollbar visible?
 

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  1. POHow to make VirtualStringTree scrollbar visible?
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    <p>I placed one VirtualStringTree(VST1) on form1 and added some data in it. The vertical scrollbar is visible regardless of the number of nodes and I did not do anything about default properties of node height. I then copied VST1 to form2 and named it as VST2 and there the scrollbar of the VST2 is no longer visible. I changed VST2's <code>parent</code> control and <code>align</code> property (I tested many times and can not remember the sequence of changing properties of align and its parent), I do not know how the scrollbar at last is shown. I then copied the VST2 to form3 and named it as VST3. And now, no matter how I tested, its vertical scrollbar can not be seen when data in VST3 is beyond its window view.</p> <p>There are too many properties of VST, what properties should I set?</p> <p>edit:</p> <pre><code>// vt is on form1, scrollbaroption.alwaysvisible:=false; // and vt can show vertical scrollbar, object vt: TVirtualStringTree Left = 1 Top = 1 Width = 353 Height = 301 Hint = 'Click header to sort' Align = alClient Header.AutoSizeIndex = 0 Header.DefaultHeight = 17 Header.Font.Charset = DEFAULT_CHARSET Header.Font.Color = clWindowText Header.Font.Height = -11 Header.Font.Name = 'MS Sans Serif' Header.Font.Style = [] Header.Options = [hoColumnResize, hoDrag, hoShowSortGlyphs, hoVisible] Indent = 3 ParentShowHint = False ShowHint = True TabOrder = 3 TreeOptions.MiscOptions = [toAcceptOLEDrop, toFullRepaintOnResize, toInitOnSave, toToggleOnDblClick, toWheelPanning] TreeOptions.PaintOptions = [toShowRoot, toThemeAware, toUseBlendedImages] TreeOptions.SelectionOptions = [toFullRowSelect, toMultiSelect, toRightClickSelect] OnChange = vtChange OnCompareNodes = vtCompareNodes OnFocusChanged = vtFocusChanged OnFreeNode = vtFreeNode OnGetText = vtGetText OnGetNodeDataSize = vtGetNodeDataSize OnHeaderClick = vtHeaderClick OnLoadNode = vtLoadNode OnSaveNode = vtSaveNode Columns = &lt; item Position = 0 Width = 168 WideText = 'Type' end item Position = 1 Width = 80 WideText = 'Frequency' end item Position = 2 Width = 80 WideText = 'Percent' end item CheckBox = True Position = 3 Width = 80 WideText = 'Rank' end item Position = 4 Width = 80 WideText = 'Length' end item Position = 5 WideText = 'Syllables' end item Position = 6 end&gt; end end //tfvt is on form2, scrollbaroption.alwaysvisible:=true; // I tested both scrollbaroption.alwaysvisible:=true and false // yesterday it showed scrollbar, today it does not. // tfvt does not show vertical scrollbar. object tfvt: TVirtualStringTree Left = 1 Top = 138 Width = 737 Height = 227 Hint = 'Click header to sort' Align = alClient Header.AutoSizeIndex = 0 Header.DefaultHeight = 17 Header.Font.Charset = DEFAULT_CHARSET Header.Font.Color = clWindowText Header.Font.Height = -11 Header.Font.Name = 'MS Sans Serif' Header.Font.Style = [] Header.Options = [hoColumnResize, hoDrag, hoShowSortGlyphs, hoVisible] Indent = 3 ParentShowHint = False ScrollBarOptions.AlwaysVisible = True ShowHint = True TabOrder = 2 TreeOptions.MiscOptions = [toAcceptOLEDrop, toFullRepaintOnResize, toInitOnSave, toToggleOnDblClick, toWheelPanning] TreeOptions.PaintOptions = [toShowRoot, toThemeAware, toUseBlendedImages] TreeOptions.SelectionOptions = [toFullRowSelect, toMultiSelect, toRightClickSelect] OnChange = tfvtChange OnCompareNodes = tfvtCompareNodes OnFocusChanged = tfvtFocusChanged OnFocusChanging = tfvtFocusChanging OnFreeNode = tfvtFreeNode OnGetText = tfvtGetText OnGetNodeDataSize = tfvtGetNodeDataSize OnHeaderClick = tfvtHeaderClick OnLoadNode = tfvtLoadNode OnSaveNode = tfvtSaveNode Columns = &lt; item Position = 0 Width = 80 end item Position = 1 Width = 80 end item Position = 2 Width = 80 end item CheckBox = True Position = 3 Width = 80 end item Position = 4 Width = 80 end item Position = 5 Width = 80 end item Position = 6 Width = 80 end&gt; end end end end // kwicvt is on form3, scrollbaroption.alwaysvisible:=true; // I tested both scrollbaroption.alwaysvisible:=true and false // Now kwicvt does not show vertical scrollbar. // object kwicvt: TVirtualStringTree Left = 32 Top = 24 Width = 433 Height = 317 Hint = 'Click header to sort' Header.AutoSizeIndex = 0 Header.DefaultHeight = 17 Header.Font.Charset = DEFAULT_CHARSET Header.Font.Color = clWindowText Header.Font.Height = -11 Header.Font.Name = 'MS Sans Serif' Header.Font.Style = [] Header.Options = [hoColumnResize, hoDrag, hoShowSortGlyphs, hoVisible] Indent = 3 ParentShowHint = False ShowHint = True TabOrder = 0 TreeOptions.AnimationOptions = [toAnimatedToggle] TreeOptions.MiscOptions = [toAcceptOLEDrop, toFullRepaintOnResize, toInitOnSave, toToggleOnDblClick, toWheelPanning] TreeOptions.PaintOptions = [toShowRoot, toThemeAware, toUseBlendedImages] TreeOptions.SelectionOptions = [toFullRowSelect, toMultiSelect, toRightClickSelect] OnChange = kwicvtChange OnCompareNodes = kwicvtCompareNodes OnFocusChanged = kwicvtFocusChanged OnFreeNode = kwicvtFreeNode OnGetText = kwicvtGetText OnGetNodeDataSize = kwicvtGetNodeDataSize OnHeaderClick = kwicvtHeaderClick OnLoadNode = kwicvtLoadNode OnSaveNode = kwicvtSaveNode Columns = &lt; item Position = 0 Width = 80 end item Alignment = taRightJustify Position = 1 Width = 80 end item Alignment = taCenter Position = 2 Width = 80 end item CheckBox = True Position = 3 Width = 80 end item Position = 4 Width = 80 end item Position = 5 Width = 80 end item Position = 6 Width = 80 end&gt; end </code></pre> <p><strong>[Edit]:</strong> </p> <p>Thank ain first.</p> <p>I tested carefully and found that if I call the same function for more than once, from the second time on, that virticalscrollbar will appear. Something like: </p> <pre><code>function fill; begin // filling VST; end; function button1click; begin fill; end; </code></pre> <p>I click button1 for the first time, verticalscrollbar does not appear; if for the second time or more, it shows perfectly.</p> <p>Why?, how to solve it?</p> <p>Thanks</p>
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    1. PO
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USWarren
    1. USWarren
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COBTW what version of delphi and what version of virtualtree?
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      1. POHow to make VirtualStringTree scrollbar visible?
      1. USain
    2. CO@ain, Delphi 7. virtualtreeview 4.87
      singulars
      1. POHow to make VirtualStringTree scrollbar visible?
      1. USWarren
    3. CO@ain, I posted 3 vst text. please have a look.
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      1. POHow to make VirtualStringTree scrollbar visible?
      1. USWarren
 

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