2.2. Bridge¶

1<?php
2
3interface Theme
4{
5    public function getBackgroundColor(): string;
6
7    public function getTextColor(): string;
8}

 1<?php
 2
 3class LightTheme implements Theme
 4{
 5    public function getBackgroundColor(): string
 6    {
 7        return "#FFFFFF";
 8    }
 9
10    public function getTextColor(): string
11    {
12        return "#000000";
13    }
14}
15
16class DarkTheme implements Theme
17{
18    public function getBackgroundColor(): string
19    {
20        return "#1E1E1E";
21    }
22
23    public function getTextColor(): string
24    {
25        return "#FFFFFF";
26    }
27}

1<?php
2
3interface WebPage
4{
5    public function getContent(): string;
6}

 1<?php
 2
 3abstract class AbstractWebPage implements WebPage
 4{
 5    protected Theme $theme;
 6
 7    public function __construct(Theme $theme)
 8    {
 9        $this->theme = $theme;
10    }
11
12    public function setTheme(Theme $theme)
13    {
14        $this->theme = $theme;
15    }
16
17    public function getBackgroundColor(): string
18    {
19        return $this->theme->getBackgroundColor();
20    }
21
22    public function getTextColor(): string
23    {
24        return $this->theme->getTextColor();
25    }
26
27    abstract public function getContent(): string;
28}

 1<?php
 2
 3class HomePage extends AbstractWebPage
 4{
 5    public function getContent(): string
 6    {
 7        return "<div style='background-color: {$this->getBackgroundColor()}; color: {$this->getTextColor()};'>Welcome to our website!</div>";
 8    }
 9}
10
11class AboutPage extends AbstractWebPage
12{
13    public function getContent(): string
14    {
15        return "<div style='background-color: {$this->getBackgroundColor()}; color: {$this->getTextColor()};'>Learn more about us...</div>";
16    }
17}

 1<?php
 2
 3// Usage example
 4$lightTheme = new LightTheme();
 5$darkTheme = new DarkTheme();
 6
 7$homePage = new HomePage($lightTheme);
 8echo $homePage->getContent() . "<br>";
 9
10$homePage->setTheme($darkTheme);
11echo $homePage->getContent() . "<br>";
12
13$aboutPage = new AboutPage($darkTheme);
14echo $aboutPage->getContent() . "<br>";