How to use Vue to implement a drag-and-drop visual editor?

Vue is a modern JavaScript framework. When implementing a visual editor, it can provide a rich set of components, instructions, life cycle hooks and other functions. It also provides some convenient APIs for the implementation of drag-and-drop interaction. In this article, we will introduce how to use Vue 2.x to implement a drag-and-drop visual editor to facilitate web developers to quickly implement corresponding functions in their projects.

1. Component structure

First, we need to split the component structure of the visual editor, which usually consists of the following components:

• Tools Column: Provides various tools and functions supported by the editor.
• Editing area: The main area used to render and edit user projects.
• Sidebar: Provides a variety of materials and templates, users can drag them into the editing area for editing.
• Canvas: Multiple layers contained in the editing area, on which users can draw or edit graphic elements.
• Element: A single graphic element on the canvas. Users can edit its properties through dragging, deformation and other interactive methods.

We can use the componentization feature of Vue to encapsulate the above components into Vue components and perform corresponding data communication and event processing.

2. Achieve drag-and-drop effect

Achieve drag-and-drop effect is one of the key functions of the visual editor. We often need to pre-define multiple elements in the sidebar so that Users place these elements on the canvas by dragging and dropping, and can edit, modify, save and other operations instantly. In Vue, you can use the v-draggable plug-in to implement a simple drag tool.

For example:

<template>
  <div v-draggable></div>
</template>

<script>
import VueDraggable from 'vuedraggable'

export default {
  components: {
    VueDraggable
  }
}
</script>

In the above code, we introduced the v-draggable plug-in and applied it to a div element so that this element can be dragged. When implementing a visual editor, we can apply it to each element to facilitate drag-and-drop interaction. At the same time, the plug-in also provides a variety of configuration items, such as setting range, drag direction, prohibiting drag, etc.

3. Implement editable elements

In the visual editor, we also need to implement editable elements, which can be dragged, transformed, selected, copied, etc. . We can use Vue directives to make elements editable.

For example, we want to implement an element that can be resized:

<template>
  <div v-draggable v-resizable></div>
</template>

<script>
import VueDraggable from 'vuedraggable'
import VueResizable from 'vue-resizable'

export default {
  components: {
    VueDraggable,
    VueResizable
  }
}
</script>

In the above code, we also applied the v-draggable directive and added the v-resizable directive. The implementation method Similar to v-draggable. Through these instructions, we can trigger corresponding events and update the properties of the component at the end of dragging, zooming, etc. operations, thereby achieving the editable effect of the element.

4. Implement data storage and rendering

Finally, we need to store and render the data edited by the user, and we can use Vuex to manage the data status.

In the editor, each element has its own properties, such as position information, size information, fill color, font size, etc. We can store these properties in Vuex as state. Each operation performed by the user during the editing process will submit a mutation. At the same time, because Vuex has responsive characteristics, once the content in the state is updated, the entire editor interface will also renewed on time.

As for rendering, you can generate a specific HTML structure based on the state in Vuex, use Vue's template syntax for rendering, and dynamically update the element view in the editor to display it to the user.

Summary

Through the above steps, we can use Vue to implement an efficient drag-and-drop visual editor. The editor has interactive effects such as drag-and-drop, zoom, and selection, and it also It has a variety of shortcut keys, automatic saving, undo/redo and other functions, which can help web developers effectively improve development efficiency and user experience.

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