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setting container width
to specify the width of a container
widget, use its width property.
this is a fixed width, unlike the CSS max-width property
that adjusts the container width up to a maximum value.
to mimic that effect in flutter,
use the constraints property of the container.
create a new BoxConstraints widget with a minWidth or maxWidth.
for nested containers, if the parent’s width is less than the child’s width,
the child container sizes itself to match the parent.
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manipulating position and size
the following examples show how to perform more complex operations
on widget position, size, and background.
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setting absolute position
by default, widgets are positioned relative to their parent.
to specify an absolute position for a widget as x-y coordinates,
nest it in a positioned widget that is,
in turn, nested in a stack widget.
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rotating components
to rotate a widget, nest it in a transform widget.
use the transform widget’s alignment and origin properties
to specify the transform origin (fulcrum) in relative and absolute terms,
respectively.
for a simple 2d rotation, in which the widget is rotated on the z axis,
create a new matrix4 identity object
and use its rotateZ() method to specify the rotation factor
using radians (degrees × π / 180).
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scaling components
to scale a widget up or down, nest it in a transform widget.
use the transform widget’s alignment and origin properties
to specify the transform origin (fulcrum) in relative or absolute terms,
respectively.
for a simple scaling operation along the x-axis,
create a new matrix4 identity object
and use its scale() method to specify the scaling factor.
when you scale a parent widget,
its child widgets are scaled accordingly.
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applying a linear gradient
to apply a linear gradient to a widget’s background,
nest it in a container widget.
then use the container widget’s decoration property to create a
BoxDecoration object, and use BoxDecoration’s gradient
property to transform the background fill.
the gradient “angle” is based on the alignment (x, y) values:
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vertical gradient
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horizontal gradient
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manipulating shapes
the following examples show how to make and customize shapes.
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rounding corners
to round the corners of a rectangular shape,
use the borderRadius property of a BoxDecoration object.
create a new BorderRadius
object that specifies the radius for rounding each corner.
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adding box shadows
in CSS you can specify shadow offset and blur in shorthand,
using the box-shadow property. this example shows two box shadows,
with properties:
in flutter, each property and value is specified separately.
use the boxShadow property of BoxDecoration to create a list of
BoxShadow widgets. you can define one or multiple
BoxShadow widgets, which can be stacked
to customize the shadow depth, color, and so on.
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making circles and ellipses
making a circle in CSS requires a workaround of applying a
border-radius of 50% to all four sides of a rectangle,
though there are basic shapes.
while this approach is supported
with the borderRadius property of BoxDecoration,
flutter provides a shape property
with BoxShape enum for this purpose.
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manipulating text
the following examples show how to specify fonts and other
text attributes. they also show how to transform text strings,
customize spacing, and create excerpts.
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