mirror of
https://github.com/Drezil/imgui.git
synced 2024-11-22 11:57:00 +00:00
Updated documentation, better FAQ on ids and usage of "##" and "###" (#107)
This commit is contained in:
ocornut
parent
81a742bf54
commit
fbbde3a7c0
82
imgui.cpp
82
imgui.cpp
@ -9,9 +9,9 @@
|
||||
Index
|
||||
- MISSION STATEMENT
|
||||
- END-USER GUIDE
|
||||
- PROGRAMMER GUIDE
|
||||
- API BREAKING CHANGES
|
||||
- TROUBLESHOOTING & FREQUENTLY ASKED QUESTIONS
|
||||
- PROGRAMMER GUIDE (read me!)
|
||||
- API BREAKING CHANGES (read me when you update!)
|
||||
- FREQUENTLY ASKED QUESTIONS & TROUBLESHOOTING (read me!)
|
||||
- ISSUES & TODO-LIST
|
||||
- CODE
|
||||
- SAMPLE CODE
|
||||
@ -27,15 +27,15 @@
|
||||
- minimize screen real-estate usage
|
||||
- minimize setup and maintenance
|
||||
- minimize state storage on user side
|
||||
- portable, minimize dependencies, run on target (consoles, etc.)
|
||||
- portable, minimize dependencies, run on target (consoles, phones, etc.)
|
||||
- efficient runtime (NB- we do allocate when "growing" content - creating a window / opening a tree node for the first time, etc. - but a typical frame won't allocate anything)
|
||||
- read about immediate-mode GUI principles @ http://mollyrocket.com/861, http://mollyrocket.com/forums/index.html
|
||||
- read about immediate-mode gui principles @ http://mollyrocket.com/861, http://mollyrocket.com/forums/index.html
|
||||
|
||||
Designed for developers and content-creators, not the typical end-user! Some of the weaknesses includes:
|
||||
- doesn't look fancy, doesn't animate
|
||||
- limited layout features, intricate layouts are typically crafted in code
|
||||
- occasionally use statically sized buffers for string manipulations - won't crash, but some long text may be clipped
|
||||
|
||||
- occasionally uses statically sized buffers for string manipulations - won't crash, but some long text may be clipped. functions like ImGui::TextUnformatted() don't have such restriction.
|
||||
|
||||
|
||||
END-USER GUIDE
|
||||
==============
|
||||
@ -63,12 +63,12 @@
|
||||
PROGRAMMER GUIDE
|
||||
================
|
||||
|
||||
- your code creates the UI, if your code doesn't run the UI is gone! == dynamic UI, no construction step, less data retention on your side, no state duplication, less sync, less errors.
|
||||
- call and read ImGui::ShowTestWindow() for user-side sample code
|
||||
- read the FAQ below this section!
|
||||
- your code creates the UI, if your code doesn't run the UI is gone! == very dynamic UI, no construction/destructions steps, less data retention on your side, no state duplication, less sync, less bugs.
|
||||
- call and read ImGui::ShowTestWindow() for sample code demonstrating most features.
|
||||
- see examples/ folder for standalone sample applications.
|
||||
- customization: use the style editor or PushStyleColor/PushStyleVar to tweak the look of the interface (e.g. if you want a more compact UI or a different color scheme).
|
||||
|
||||
|
||||
- getting started:
|
||||
- initialisation: call ImGui::GetIO() and fill the 'Settings' data.
|
||||
- every frame:
|
||||
@ -167,29 +167,57 @@
|
||||
- 2014/08/28 (1.09) - changed the behavior of IO.PixelCenterOffset following various rendering fixes
|
||||
|
||||
|
||||
TROUBLESHOOTING & FREQUENTLY ASKED QUESTIONS
|
||||
FREQUENTLY ASKED QUESTIONS & TROUBLESHOOTING
|
||||
============================================
|
||||
|
||||
If text or lines are blurry when integrating ImGui in your engine:
|
||||
|
||||
- in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
|
||||
|
||||
If you are confused about the meaning or use of ID in ImGui:
|
||||
- many widgets requires state to be carried over multiple frames (most typically ImGui often wants remember what is the "active" widget).
|
||||
to do so they need an unique ID. unique ID are typically derived from a string label, an indice or a pointer.
|
||||
when you call Button("OK") the button shows "OK" and also use "OK" as an ID.
|
||||
A primer on the meaning and use of ID in ImGui:
|
||||
|
||||
- widgets require state to be carried over multiple frames (most typically ImGui often needs to remember what is the "active" widget).
|
||||
to do so they need an unique ID. unique ID are typically derived from a string label, an integer index or a pointer.
|
||||
|
||||
Button("OK"); // Label = "OK", ID = hash of "OK"
|
||||
Button("Cancel"); // Label = "Cancel", ID = hash of "Cancel"
|
||||
|
||||
- ID are uniquely scoped within Windows so no conflict can happen if you have two buttons called "OK" in two different Windows.
|
||||
within a same Window, use PushID() / PopID() to easily create scopes and avoid ID conflicts.
|
||||
so if you have a loop creating "multiple" items, you can use PushID() / PopID() with the index of each item, or their pointer, etc.
|
||||
some functions like TreeNode() implicitly creates a scope for you by calling PushID()
|
||||
- when dealing with trees, ID are important because you want to preserve the opened/closed state of tree nodes.
|
||||
depending on your use cases you may want to use strings, indices or pointers as ID. experiment and see what makes more sense!
|
||||
e.g. When displaying a single object that may change over time, using a static string as ID will preserve your node open/closed state when the targeted object change
|
||||
e.g. When displaying a list of objects, using indices or pointers as ID will preserve the node open/closed state per object
|
||||
- when passing a label you can optionally specify extra unique ID information within the same string using "##". This helps solving the simpler collision cases.
|
||||
e.g. "Label" display "Label" and uses "Label" as ID
|
||||
e.g. "Label##Foobar" display "Label" and uses "Label##Foobar" as ID
|
||||
e.g. "##Foobar" display an empty label and uses "##Foobar" as ID
|
||||
- read articles about immediate-mode ui principles (see web links) to understand the requirement and use of ID.
|
||||
|
||||
- when passing a label you can optionally specify extra unique ID information within string itself. This helps solving the simpler collision cases.
|
||||
use "##" to pass a complement to the ID that won't be visible to the end-user:
|
||||
|
||||
Button("Play##0"); // Label = "Play", ID = hash of "Play##0"
|
||||
Button("Play##1"); // Label = "Play", ID = hash of "Play##1" (different from above)
|
||||
|
||||
use "###" to pass a label that isn't part of ID. You can use that to change labels while preserving a constant ID.
|
||||
|
||||
Button("Hello###ID"; // Label = "Hello", ID = hash of "ID"
|
||||
Button("World###ID"; // Label = "World", ID = hash of "ID" (same as above)
|
||||
|
||||
- use PushID() / PopID() to create scopes and avoid ID conflicts within the same Window:
|
||||
|
||||
Button("Click"); // Label = "Click", ID = hash of "Click"
|
||||
PushID("node");
|
||||
Button("Click"); // Label = "Click", ID = hash of "node" and "Click"
|
||||
for (int i = 0; i < 100; i++)
|
||||
{
|
||||
PushID(i);
|
||||
Button("Click"); // Label = "Click", ID = hash of "node" and i and "label"
|
||||
PopID();
|
||||
}
|
||||
PopID();
|
||||
PushID(my_ptr);
|
||||
Button("Click"); // Label = "Click", ID = hash of ptr and "Click"
|
||||
PopID();
|
||||
|
||||
so if you have a loop creating multiple items, you can use PushID() / PopID() with the index of each item, or their pointer, etc.
|
||||
some functions like TreeNode() implicitly creates a scope for you by calling PushID().
|
||||
|
||||
- when working with trees, ID are used to preserve the opened/closed state of tree nodes.
|
||||
depending on your use cases you may want to use strings, indices or pointers as ID.
|
||||
e.g. when displaying a single object that may change over time (1-1 relationship), using a static string as ID will preserve your node open/closed state when the targeted object change.
|
||||
e.g. when displaying a list of objects, using indices or pointers as ID will preserve the node open/closed state differerently. experiment and see what makes more sense!
|
||||
|
||||
If you want to load a different font than the default (ProggyClean.ttf, size 13)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user