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93 lines
2.3 KiB
Markdown
93 lines
2.3 KiB
Markdown
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[← Home](../README.md) · [Intuition](README.md)
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# Screens — OpenScreen, CloseScreen, SA_ Tags
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## Overview
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An Amiga **Screen** is a complete display context: a `ViewPort` with its own `BitMap`, colour palette, and resolution. Multiple screens can coexist and be dragged up/down to reveal each other.
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---
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## Screen Types
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| Type | Constant | Description |
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|---|---|---|
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| Workbench | `WBENCHSCREEN` | The default desktop screen |
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| Custom | `CUSTOMSCREEN` | Application-owned screen |
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| Public | `PUBLICSCREEN` | Named screen other apps can open windows on |
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---
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## Opening a Screen (OS 2.0+ TagList)
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```c
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struct Screen *scr = OpenScreenTags(NULL,
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SA_Width, 640,
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SA_Height, 256,
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SA_Depth, 4, /* 16 colours */
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SA_DisplayID, HIRES_KEY,
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SA_Title, "My Screen",
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SA_ShowTitle, TRUE,
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SA_Type, CUSTOMSCREEN,
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SA_Pens, (ULONG)~0, /* use 3D pen defaults */
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SA_Font, &topaz8,
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TAG_DONE);
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```
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### Common SA_ Tags
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| Tag | Description |
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|---|---|
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| `SA_Width`, `SA_Height` | Screen dimensions |
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| `SA_Depth` | Bitplane count (1–8) |
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| `SA_DisplayID` | ModeID from display database |
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| `SA_Title` | Title bar text |
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| `SA_ShowTitle` | Show/hide title bar |
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| `SA_Type` | `CUSTOMSCREEN`, `PUBLICSCREEN` |
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| `SA_Behind` | Open behind other screens |
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| `SA_Quiet` | No title bar at all |
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| `SA_AutoScroll` | Allow autoscrolling |
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| `SA_Overscan` | Overscan type (`OSCAN_TEXT`, `OSCAN_STANDARD`, `OSCAN_MAX`) |
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| `SA_Pens` | DrawInfo pen array (3D look) |
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| `SA_Interleaved` | Use interleaved bitmap |
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| `SA_Colors32` | 32-bit colour palette |
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| `SA_PubName` | Public screen name |
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---
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## Closing
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```c
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CloseScreen(scr);
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/* All windows must be closed first! */
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```
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---
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## Public Screens
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```c
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/* Open a public screen: */
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struct Screen *pub = OpenScreenTags(NULL,
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SA_Type, PUBLICSCREEN,
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SA_PubName, "MYAPP",
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SA_Title, "My Public Screen",
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TAG_DONE);
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PubScreenStatus(pub, 0); /* make it available */
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/* From another process, open a window on it: */
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struct Screen *found = LockPubScreen("MYAPP");
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struct Window *win = OpenWindowTags(NULL,
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WA_PubScreen, found,
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WA_Title, "On MYAPP",
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TAG_DONE);
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UnlockPubScreen(NULL, found);
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```
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---
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## References
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- NDK39: `intuition/screens.h`, `intuition/intuition.h`
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- ADCD 2.1: `OpenScreenTagList`, `CloseScreen`, `LockPubScreen`
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