( Aspect )
Since aspectus in Latin means "looked at", an aspect of something is basically the direction from which it's looked at. So we may say that travel is your favorite aspect of your job, or that eating well is one aspect of a healthy life. If you look at a stage set from the front, it looks completely different than from behind, where all the mechanisms are visible, and both aspects are important. The word can be very useful when you're analyzing something, and it's used a great deal in the writings of scholars.
( Aspect )
Replaced elements with an intrinsic aspect ratio use that aspect ratio, otherwise the box has no preferred aspect ratio. Size calculations involving intrinsic aspect ratio always work with the content box dimensions.
The box's preferred aspect ratio is the specified ratio of width / height. If height and the preceding slash character are omitted, height defaults to 1. Size calculations involving preferred aspect ratio work with the dimensions of the box specified by box-sizing.
Aspects are similar to rules in that they have an implementation function thatgenerates actions and returns providers. However, their power comes fromthe way the dependency graph is built for them. An aspect has an implementationand a list of all attributes it propagates along. Consider an aspect A thatpropagates along attributes named "deps". This aspect can be applied toa target X, yielding an aspect application node A(X). During its application,aspect A is applied recursively to all targets that X refers to in its "deps"attribute (all attributes in A's propagation list).
The only edges that are shadowed are the edges along the attributes inthe propagation set, thus the runtime_deps edge is not shadowed in thisexample. An aspect implementation function is then invoked on all nodes inthe shadow graph similar to how rule implementations are invoked on the nodesof the original graph.
This example demonstrates how to recursively print the source files for arule and all of its dependencies that have a deps attribute. It showsan aspect implementation, an aspect definition, and how to invoke the aspectfrom the Bazel command line.
The following example demonstrates using an aspect from a target rulethat counts files in targets, potentially filtering them by extension.It shows how to use a provider to return values, how to use parameters to passan argument into an aspect implementation, and how to invoke an aspect from a rule.
attrs defines a set of attributes for an aspect. Public aspect attributesare of type string and are called parameters. Parameters must have avaluesattribute specified on them. This example has a parameter called extensionthat is allowed to have '*', 'h', or 'cc' as a value.
Parameter values for the aspect are taken from the string attribute with the samename of the rule requesting the aspect (see the definition of file_count_rule).Aspects with parameters cannot be used via the command line because there is nosyntax to define the parameters.
Aspects are also allowed to have private attributes of types label orlabel_list. Private label attributes can be used to specify dependencies ontools or libraries that are needed for actions generated by aspects. There is nota private attribute defined in this example, but the following code snippetdemonstrates how you could pass in a tool to an aspect:
The set of providers for an aspect application A(X) is the union of providersthat come from the implementation of a rule for target X and from theimplementation of aspect A. The providers that a rule implementation propagatesare created and frozen before aspects are applied and cannot be modified from anaspect. It is an error if a target and an aspect that is applied to it eachprovide a provider with the same type, with the exceptions ofOutputGroupInfo(which is merged, so long as therule and aspect specify different output groups) andInstrumentedFilesInfo(which is taken from the aspect). This means that aspect implementations maynever return DefaultInfo.
For returning providers, the values of attributes along whichthe aspect is propagated (from the attr_aspects list) are replaced withthe results of an application of the aspect to them. For example, if targetX has Y and Z in its deps, ctx.rule.attr.deps for A(X) will be [A(Y), A(Z)].In this example, ctx.rule.attr.deps are Target objects that are theresults of applying the aspect to the 'deps' of the original target to whichthe aspect has been applied.
The rule definition demonstrates how to define a parameter (extension)and give it a default value (*). Note that having a default value thatwas not one of 'cc', 'h', or '*' would be an error due to therestrictions placed on the parameter in the aspect definition.
This demonstrates how to pass the extension parameter into the aspectvia the rule. Since the extension parameter has a default value in therule implementation, extension would be considered an optional parameter.
Aspects are a way to apply an operation to all constructs in a given scope. The aspect could modify the constructs, such as by adding tags. Or it could verify something about the state of the constructs, such as making sure that all buckets are encrypted.
The AWS CDK uses aspects to tag resources, but the framework can also be used for other purposes. For example, you can use it to validate or change the AWS CloudFormation resources that are defined for you by higher-level constructs.
Aspects don't propagate across Stage construct boundaries, because Stages are self-contained and immutable after definition. Apply aspects on the Stage construct itself (or lower) if you want them to visit constructs inside the Stage.
The following example validates that all buckets created in the stack have versioning enabled. The aspect adds an error annotation to the constructs that fail the validation. This results in the synth operation failing and prevents deploying the resulting cloud assembly.
In order to avoid unintentional overflow,the automatic minimum size in the ratio-dependent axis of a box with a preferred aspect ratio that is neither a replaced element nor a scroll container is its min-content size capped by its maximum size.
The width of the container, being auto,resolves through the aspect ratio to 100px.However, its min-width, being auto,resolves to 150px.The resulting width of the container is thus 150px.To ignore the contents when sizing the container, min-width: 0 can be specified.
Sizing constraints in either axis(the origin axis)are transferred through the preferred aspect ratio and applied to any indefinite minimum, maximum, or preferred sizein the other axis (the destination axis)as follows:
Aspect ratio is most commonly expressed as two integers and a colon in the dimensions of: width:height, or x:y. The most common aspect ratios for photography are 4:3 and 3:2, while video, and more recent consumer cameras, tend to have a 16:9 aspect ratio.Two images with the same aspect ratio. One is 634 x 951px while the other is 200 x 300px. Both have a 2:3 aspect ratio.With the advent of responsive design, maintaining aspect ratio has been increasingly important for web developers, especially as image dimensions differ and element sizes shift based on available space.Some examples of where maintaining aspect ratio become important are:Creating responsive iframes, where they are 100% of a parent's width, and the height should remain a specific viewport ratioCreating intrinsic placeholder containers for images, videos, and embeds to prevent re-layout when the items load and take up spaceCreating uniform, responsive space for interactive data visualizations or SVG animationsCreating uniform, responsive space for multi-element components such as cards or calendar datesCreating uniform, responsive space for multiple images of varying dimension (can be used alongside object-fit)Object-fit #Defining an aspect ratio helps us with sizing media in a responsive context. Another tool in this bucket is the object-fit property, which enables users to describe how an object (such an as image) within a block should fill that block:Showcasing various object-fit values. See demo on Codepen.The initial and fill values re-adjust the image to fill the space. In our example, this causes the image to be squished and blurry, as it re-adjusts pixels. Not ideal. object-fit: cover uses the image's smallest dimension to fill the space and crops the image to fit into it based on this dimension. It "zooms in" at its lowest boundary. object-fit: contain ensures that the entire image is always visible, and so the opposite of cover, where it takes the size of the largest boundary (in our example above this is width), and resizes the image to maintain its intrinsic aspect ratio while fitting into the space. The object-fit: none case shows the image cropped in its center (default object position) at its natural size.object-fit: cover tends to work in most situations to ensure a nice uniform interface when dealing with images of varying dimensions, however, you lose information this way (the image is cropped at its longest edges).If these details are important (for example, when working with a flat lay of beauty products), cropping important content is not acceptable. So the ideal scenario would be responsive images of varying sizes that fit the UI space without cropping.The old hack: maintaining aspect ratio with padding-top #Using padding-top to set a 1:1 aspect ratio on post preview images within a carousel.In order to make these more responsive, we can use aspect ratio. This allows for us to set a specific ratio size and base the rest of the media on an individual axis (height or width).A currently well-accepted cross-browser solution for maintaining aspect ratio based on an image's width is known as the "Padding-Top Hack". This solution requires a parent container and an absolutely placed child container. One would then calculate the aspect ratio as a percentage to set as the padding-top. For example:1:1 aspect ratio = 1 / 1 = 1 = padding-top: 100%4:3 aspect ratio = 3 / 4 = 0.75 = padding-top: 75%3:2 aspect ratio = 2 / 3 = 0.66666 = padding-top: 66.67%16:9 aspect ratio = 9 / 16 = 0.5625 = padding-top: 56.25%Now that we have identified the aspect ratio value, we can apply that to our parent container. Consider the following example: 041b061a72