To my knowledge, there is no 'PreviewPropertyChanged' that you can subscribe to for a dependency property, but I need to know a value WILL be changing. My thought is to sort of re-purpose the Coerce Value method and do my check there (naturally after any actual coercion takes place since it makes sens that gets called before the actual change takes place. That way I can check the existing value versus the coerced value to determine a change, and if there is one, then fire my Preview' code. This the correct way to do this or am I missing something?
In WPF, what's the best way to get a PreviewPropertyChanged notification for a dependency property?
154 Views Asked by Mark A. Donohoe At
1
There are 1 best solutions below
Related Questions in WPF
- How to use meshgrid with large arrays in Matplotlib?
- Enforcing that inputs sum to 1 and are contained in the unit interval in scikit-learn
- scikit-learn preperation
- Python KNeighborsClassifier
- How to interpret scikit's learn confusion matrix and classification report?
- svmlight / libsvm format
- Scikit-learn: overriding a class method in a classifier
- Memory Error with Classifier fit and partial_fit
- Difference between weka tool's correlation coefficient and scikit learn's coefficient of determination score
- Peak fitting with gaussian mixure model (Scikit); how to sample from a discrete pdf?
Related Questions in EVENT-HANDLING
- How to use meshgrid with large arrays in Matplotlib?
- Enforcing that inputs sum to 1 and are contained in the unit interval in scikit-learn
- scikit-learn preperation
- Python KNeighborsClassifier
- How to interpret scikit's learn confusion matrix and classification report?
- svmlight / libsvm format
- Scikit-learn: overriding a class method in a classifier
- Memory Error with Classifier fit and partial_fit
- Difference between weka tool's correlation coefficient and scikit learn's coefficient of determination score
- Peak fitting with gaussian mixure model (Scikit); how to sample from a discrete pdf?
Related Questions in DEPENDENCY-PROPERTIES
- How to use meshgrid with large arrays in Matplotlib?
- Enforcing that inputs sum to 1 and are contained in the unit interval in scikit-learn
- scikit-learn preperation
- Python KNeighborsClassifier
- How to interpret scikit's learn confusion matrix and classification report?
- svmlight / libsvm format
- Scikit-learn: overriding a class method in a classifier
- Memory Error with Classifier fit and partial_fit
- Difference between weka tool's correlation coefficient and scikit learn's coefficient of determination score
- Peak fitting with gaussian mixure model (Scikit); how to sample from a discrete pdf?
Related Questions in CHANGE-NOTIFICATION
- How to use meshgrid with large arrays in Matplotlib?
- Enforcing that inputs sum to 1 and are contained in the unit interval in scikit-learn
- scikit-learn preperation
- Python KNeighborsClassifier
- How to interpret scikit's learn confusion matrix and classification report?
- svmlight / libsvm format
- Scikit-learn: overriding a class method in a classifier
- Memory Error with Classifier fit and partial_fit
- Difference between weka tool's correlation coefficient and scikit learn's coefficient of determination score
- Peak fitting with gaussian mixure model (Scikit); how to sample from a discrete pdf?
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
You got it. The CoerceValueCallback is a good way to raise an "XXXChanging" event, which gives consumers of the object a change to change the value or cancel the change. Your coerce would then return the new value, or the modified value. You can get the old value directly from the DependencyObject, as it's not included in the CoerceValueCallback parameters.
On a side note, "Preview" events are tunneling events. This means they go from the top of the tree down. Bubbling events go from the bottom up. So I would avoid calling it PreviewPropertyChanged, as that implies the property has already changed and it is a tunneling event.