How to Design a Responsive Calculator Keypad Layout with Flexbox?

Calculator Keypad Layout with Flexbox

Designing a calculator with Flexbox can present challenges when attempting to create keys of varying sizes. This article will demonstrate how to address this issue by implementing a responsive keyboard layout for a calculator using Flexbox.

Layout

To accommodate both single-width and double-width keys, the layout is divided into two sections:

1. Main Keys: The standard keys that occupy a single width. These are arranged in a flexbox container with flex-wrap to create multiple rows as needed.

2. Special Keys: The keys that require a double width or height are wrapped in their own flexbox containers:

   • Double Width Key: The zero key is a double-width key and is contained within a flex container that spans 66.67% of the space in the main keys section.
   • Double Height Key: The equals key is a double-height key and is contained within a flex container that spans the full height of the special keys section.

CSS Styles

/* 1. Normalize styles */
* { box-sizing: border-box; }

/* 2. Flexbox container for the anomaly keys */
#anomaly-keys-wrapper {
  display: flex;
  width: 100%;
}

/* 3. First section of the anomaly keys (main keys) */
#anomaly-keys-wrapper > section:first-child {
  display: flex;
  flex-wrap: wrap;
  width: 75%;
}

/* 4. Individual keys within the main keys section */
#anomaly-keys-wrapper > section:first-child > div {
  flex: 1 0 33.33%;
}

/* 5. Double-width key within the main keys section */
#anomaly-keys-wrapper > section:first-child > div:nth-child(4) {
  flex-basis: 66.67%;
}

/* 6. Second section of the anomaly keys (special keys) */
#anomaly-keys-wrapper > section:last-child {
  width: 25%;
  display: flex;
  flex-direction: column;
}

/* 7. Double-height key within the special keys section */
#anomaly-keys-wrapper .tall {
  width: 100%;
  flex: 1;
}

Result

This layout ensures that all keys are correctly positioned and sized, both on desktop and mobile devices. The equal key has a double height, while the zero key has a double width, demonstrating the versatility of Flexbox in creating responsive and customizable layouts.

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