11.12: Interaction
- Page ID
- 45944
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Mondrian offers a number of contextual interaction mechanisms. The interaction object contains a number of keywords for that purpose. The message highlightWhenOver: takes a block as argument. This block returns a list of the nodes to highlight when the mouse enters a node. Consider the example:
view interaction
highlightWhenOver: [:v | {v - 1 . v + 1. v + 4 . v - 4}].
view shape rectangle
width: 40;
height: 30;
withText.
view nodes: (1 to: 16).
view gridLayout gapSize: 2.
Entering the node 5 highlights the nodes 4, 6, 1 and 9. This mechanism is quite efficient to not overload with connecting edges. Only the information is shown for the node of interest.
A more compelling application of highlightWhenOver: is with the following example. A hierarchy of class is displayed on the left hand side. On the right hand size a hierarchy of unit tests is displayed. Locating the mouse pointer above a unit test highlights the classes that are referenced by one of the unit test methods. Consider the (rather long) script:
"System complexity of the collection classes"
view shape rectangle
width: [ :each | each instVarNames size * 5 ];
height: [ :each | each methods size ];
linearFillColor: #numberOfLinesOfCode within: Collection withAllSubclasses.
view nodes: Collection withAllSubclasses.
view edgesFrom: #superclass.
view treeLayout.
"Unit tests of the package CollectionsTest"
view shape rectangle withoutBorder.
view node: 'compound' forIt: [
view shape label.
view node: 'Collection tests'.
view node: 'Collection tests' forIt: [
| testClasses |
testClasses := (PackageInfo named: 'CollectionsTests') classes reject: #isTrait.
view shape rectangle
width: [ :cls | (cls methods inject: 0 into: [ :sumLiterals :mtd | sumLiterals + mtd
allLiterals size]) / 100 ];
height: [ :cls | cls numberOfLinesOfCode / 50 ].
view interaction
highlightWhenOver: [ :cls | ((cls methods inject: #()
into: [:sum :el | sum , el allLiterals ]) select: [:v | v isKindOf: Association ]
thenCollect: #value) asSet ].
view nodes: testClasses.
view edgesFrom: #superclass.
view treeLayout ].
view verticalLineLayout alignLeft
].
The script contains two parts. The first part is the ubiquitous system complexity of the collection framework. The second part renders the tests contained in the CollectionsTests. The width of a class is the number of literals contained in it. The height is the number of lines of code. Since the collection tests makes a great use of traits to reuse code, these metrics have to be scaled down. When the mouse is placed over a test unit, then all the classes of the collection framework referenced in this class are highlighted.
