TextKit: How is the editor placeholder feature implemented in Xcode?
I took a deep dive into TextKit and wondered how the editor placeholders are implemented in the Xcode code editor:
You can also try this yourself and type something along the lines of: <#Hello#>, which automatically turns into a placeholder.
The Xcode editor is built with TextKit. After some research I came up with two possible strategies:
- Using
NSTextAttachment: as soon as a string matching the placeholder pattern<#...#>is detected, that string is removed and replaced by aNSTextAttachment, which handles drawing the "badge-shaped" background and the text. - Using
NSLayoutManager: not sure if this would work, but it could go like this:
- The start and end markers (glyphs)
<#+#>are hidden (layoutManager(... shouldGenerateGlyphs, forGlyphRange...)) - The layout manager handles drawing the badge background in
drawBackground(forGlyphRange glyphsToShow: NSRange, at origin: NSPoint)
- The start and end markers (glyphs)
I'd like to implement something similar and would appreciate any suggestions, as to which way to proceed.
xcode cocoa nsattributedstring textkit nstextattachment
asked Nov 21 '18 at 15:35
Mark
2,83212964
add a comment |
I took a deep dive into TextKit and wondered how the editor placeholders are implemented in the Xcode code editor:
You can also try this yourself and type something along the lines of: <#Hello#>, which automatically turns into a placeholder.
The Xcode editor is built with TextKit. After some research I came up with two possible strategies:
- Using
NSTextAttachment: as soon as a string matching the placeholder pattern<#...#>is detected, that string is removed and replaced by aNSTextAttachment, which handles drawing the "badge-shaped" background and the text. - Using
NSLayoutManager: not sure if this would work, but it could go like this:
- The start and end markers (glyphs)
<#+#>are hidden (layoutManager(... shouldGenerateGlyphs, forGlyphRange...)) - The layout manager handles drawing the badge background in
drawBackground(forGlyphRange glyphsToShow: NSRange, at origin: NSPoint)
- The start and end markers (glyphs)
I'd like to implement something similar and would appreciate any suggestions, as to which way to proceed.
xcode cocoa nsattributedstring textkit nstextattachment
asked Nov 21 '18 at 15:35
Mark
2,83212964
add a comment |
I took a deep dive into TextKit and wondered how the editor placeholders are implemented in the Xcode code editor:
You can also try this yourself and type something along the lines of: <#Hello#>, which automatically turns into a placeholder.
The Xcode editor is built with TextKit. After some research I came up with two possible strategies:
- Using
NSTextAttachment: as soon as a string matching the placeholder pattern<#...#>is detected, that string is removed and replaced by aNSTextAttachment, which handles drawing the "badge-shaped" background and the text. - Using
NSLayoutManager: not sure if this would work, but it could go like this:
- The start and end markers (glyphs)
<#+#>are hidden (layoutManager(... shouldGenerateGlyphs, forGlyphRange...)) - The layout manager handles drawing the badge background in
drawBackground(forGlyphRange glyphsToShow: NSRange, at origin: NSPoint)
- The start and end markers (glyphs)
I'd like to implement something similar and would appreciate any suggestions, as to which way to proceed.
xcode cocoa nsattributedstring textkit nstextattachment
asked Nov 21 '18 at 15:35
Mark
2,83212964
I took a deep dive into TextKit and wondered how the editor placeholders are implemented in the Xcode code editor:
You can also try this yourself and type something along the lines of: <#Hello#>, which automatically turns into a placeholder.
The Xcode editor is built with TextKit. After some research I came up with two possible strategies:
- Using
NSTextAttachment: as soon as a string matching the placeholder pattern<#...#>is detected, that string is removed and replaced by aNSTextAttachment, which handles drawing the "badge-shaped" background and the text. - Using
NSLayoutManager: not sure if this would work, but it could go like this:
- The start and end markers (glyphs)
<#+#>are hidden (layoutManager(... shouldGenerateGlyphs, forGlyphRange...)) - The layout manager handles drawing the badge background in
drawBackground(forGlyphRange glyphsToShow: NSRange, at origin: NSPoint)
- The start and end markers (glyphs)
I'd like to implement something similar and would appreciate any suggestions, as to which way to proceed.
xcode cocoa nsattributedstring textkit nstextattachment
xcode cocoa nsattributedstring textkit nstextattachment
asked Nov 21 '18 at 15:35
Mark
2,83212964
asked Nov 21 '18 at 15:35
Mark
2,83212964
asked Nov 21 '18 at 15:35
Mark
2,83212964
asked Nov 21 '18 at 15:35
Mark
2,83212964
asked Nov 21 '18 at 15:35
Mark
2,83212964
2,83212964
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53415525%2ftextkit-how-is-the-editor-placeholder-feature-implemented-in-xcode%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53415525%2ftextkit-how-is-the-editor-placeholder-feature-implemented-in-xcode%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
