Add demo on styling grid with HasTheme

[ZheSun88]

Part of the ticket vaadin/flow#4318

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This change is 

[SomeoneToIgnore]

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src/test/java/com/vaadin/flow/component/grid/demo/GridView.java, line 1095 at r1 (raw file):

        grid.addColumn(Person::getName).setHeader("Name");
        grid.addColumn(Person::getAge).setHeader("Age");
        grid.addThemeNames("no-border", "no-row-borders", "row-stripes");

I propose to do this with theme variants.

In order to do this, you need to:

• Add the variants generated: https://github.com/vaadin/flow/blob/master/flow-components-parent/flow-generated-components/src/main/java/com/vaadin/flow/component/grid/GridVariant.java
• Add two methods for manilulating the variants: https://github.com/vaadin/flow/blob/master/flow-components-parent/flow-generated-components/src/main/java/com/vaadin/flow/component/grid/GeneratedVaadinGrid.java#L308
• Use them here

[SomeoneToIgnore]

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src/test/java/com/vaadin/flow/component/grid/demo/GridView.java, line 1095 at r1 (raw file):

        grid.addColumn(Person::getName).setHeader("Name");
        grid.addColumn(Person::getAge).setHeader("Age");
        grid.addThemeNames("no-border", "no-row-borders", "row-stripes");

Would it look better if you add some sort of theme toggling?
For instance, a button that will add and remove some themes.

[SomeoneToIgnore]

Reviewed 3 of 3 files at r1.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @vaadin-bot and @ZheSun88)

[ZheSun88]

Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @vaadin-bot and @ZheSun88)

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src/test/java/com/vaadin/flow/component/grid/demo/GridView.java, line 1095 at r1 (raw file):

Previously, SomeoneToIgnore (Kirill Bulatov) wrote…

I propose to do this with theme variants.

In order to do this, you need to:

• Add the variants generated: https://github.com/vaadin/flow/blob/master/flow-components-parent/flow-generated-components/src/main/java/com/vaadin/flow/component/grid/GridVariant.java
• Add two methods for manilulating the variants: https://github.com/vaadin/flow/blob/master/flow-components-parent/flow-generated-components/src/main/java/com/vaadin/flow/component/grid/GeneratedVaadinGrid.java#L308
• Use them here

actually, this PR is wrong.. because the purpose of the demo should be theme the component inside grid..

the necessary part in the PR is only adding the hasTheme interface. I think i need to close this PR.. ...

[SomeoneToIgnore]

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src/test/java/com/vaadin/flow/component/grid/demo/GridView.java, line 1095 at r1 (raw file):

Previously, ZheSun88 (Sun Zhe) wrote…

actually, this PR is wrong.. because the purpose of the demo should be theme the component inside grid..

the necessary part in the PR is only adding the hasTheme interface. I think i need to close this PR.. ...

Nope, as discussed, you carry on with this one :)

[denis-anisimov]

Reviewed 2 of 3 files at r1, 1 of 1 files at r2.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @ZheSun88)

[vaadin-bot]

SonarQube analysis reported 21 issues

• 1 critical
• 7 major
• 12 minor
• 1 info

Top 10 extra issues

Note: The following issues were found on lines that were not modified in the pull request. Because these issues can't be reported as line comments, they are summarized here:

1. Grid.java#L1655: Remove usage of generic wildcard type.
2. Grid.java#: This file has 1,197 lines, which is greater than 750 authorized. Split it into smaller files.
3. Grid.java#L1299: Call "Optional#isPresent()" before accessing the value.
4. Grid.java#L1300: Either log or rethrow this exception.
5. Grid.java#L1313: Either log or rethrow this exception.
6. Grid.java#L2070: Call "Optional#isPresent()" before accessing the value.
7. Grid.java#L2080: Call "Optional#isPresent()" before accessing the value.
8. GridViewIT.java#L814: Remove this use of "Thread.sleep()".
9. Grid.java#L454: Remove this method to simply inherit it.
10. Grid.java#L1390: Use isEmpty() to check whether the collection is empty or not.

[SomeoneToIgnore]

Reviewed 1 of 1 files at r3.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @ZheSun88)

a discussion (no related file):
Should we close it or update the same way as in vaadin/vaadin-button-flow#77?

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[ZheSun88]

Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @ZheSun88)

a discussion (no related file):

Previously, SomeoneToIgnore (Kirill Bulatov) wrote…

Should we close it or update the same way as in vaadin/vaadin-button-flow#77?

yes

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