LabVIEW loads and uses custom symbols in tree control projects

LabVIEW Load and use custom symbols in tree control projects

Found a tree control method for loading custom symbols located next to tree control items . Tried many ways to use it, but encountered problems in displaying custom symbols . How the properties and methods of these tree controls work ？

Use the following methods to add symbols to tree controls , Picture or picture . Attached VI Provides an example of using tree custom symbols .TraverseTreeSetCustomSymbolsLLB By using Custom Item Symbols:Set to Custom Symbol Array Method adds many symbols to the tree control .Tree Image VI Use Custom Item Symbols:Set toCustom Symbol Method to add a separate symbol to the tree control .

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Add picture comments , No more than 140 word （ Optional ）

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LabVIEW A series of built-in symbols are provided for users . Use Custom Item Symbols:Set to Custom Symbol or CustomItem Symbols:Set to Custom Symbol Array Method to add one or more custom symbols to the symbol array . Use Read BMP File, Read JPEG File, Read PNG File, or Picture to Pixmap VI Read the image file for customized symbols from the disk .

Use Edit TreeItems:Add Item Method to add an item to the tree control . You can also truncate an existing project .

The new obtained in the second step TAG Connect to Active Item:Tag Property to specify the current activity TAG.

Index to... By connecting the symbols specified in the first step Active Item:Symbol Index Property to specify which symbol is used by the current active project .

By connecting a TRUE It's worth it Visible Items:Symbols Visible Property to ensure that the symbol is visible . This attribute defaults to true , So this step is usually unnecessary .

Built in symbol array

LabVIEW The index number provided is 1-39 Of 40 Default symbols . Indexes 0 Is an empty symbol . Cannot load a custom symbol to the index 0 Because the index is kept as an empty symbol . The maximum index number that can be set is 32767, Therefore, the maximum array size that can be created is 32768.

Use CustomItem Symbols Method

If you use CustomItem Symbols:Set to Custom Symbol Method ,LabVIEW You will be prompted to give the index and the symbol itself . If you specify a location at 1 To 39 Index values between ,LabVIEW The specified custom symbol will be used to override its built-in symbol . If you want to keep the built-in symbol in its original state , Please add symbols , Specify greater than or equal to... For custom symbols 40 The index of the value .

If you use CustomItem Symbols:Set to Custom Symbol Array Method ,LabVIEW You will be prompted to give an array of symbols . The specified array will overwrite all index values from 0 Starting symbol . However ,LabVIEW The index value specified will be ignored as 0 Pictures of the . If you want to keep the built-in symbols when adding an array of symbols , Please create one with 40 An array of constant images of elements , Each of these elements is an empty image . Connect the array to Custom Item Symbols:Set to Custom Symbol Array Method to the custom symbol array .LabVIEW All empty images will be ignored , Make the front 40 Elements remain in their original state , And the index is 40 Start by adding the first custom symbol .

If some built-in symbols are covered , By using Custom Item Symbols:Revert to Built In Symbol perhaps Custom Item Symbols:Revert All to Built In Symbols Method to restore a single built-in symbol and restore all built-in symbols respectively .

You can only use CustomItem Symbols:Get Symbol and Custom Item Symbols:Get SymbolArray Method to retrieve custom symbols . If the index is 1 to 40 Symbols of use these methods , Then the method will only return the corresponding image for those customized items that cover the built-in symbols .

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Examples and information mentioned above , Both in word In the attachment in , Click to download . Learn more , Contact us .

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