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Add pagination to the text app

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This commit is contained in:
Correl Roush 2023-02-09 13:55:03 -05:00
parent 52d13bb40b
commit 980d830e94
1 changed files with 58 additions and 33 deletions
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91
src/main.cpp
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@ -276,37 +276,62 @@ public:
class Text: public App {
public:
Text() {
String sample =
"I've seen things you people wouldn't believe.\n"
"Attack ships on fire off the shoulder of Orion.\n"
"I watched c-beams glitter in the dark near the Tannhäuser Gate.\n"
"All those moments will be lost in time, like tears in rain.\n"
"Time to die.";
M5.Display.startWrite();
M5.Display.setEpdMode(epd_quality);
M5.Display.setRotation(0);
M5.Display.clearDisplay(TFT_WHITE);
M5.Display.setFont(&fonts::FreeSans9pt7b);
M5.Display.setTextSize(2);
M5.Display.setCursor(0, 0);
printPage(M5.Display, sample);
textArea = new M5Canvas(&M5.Display);
textArea->createSprite(M5.Display.width() - 50, M5.Display.height() - 50);
textArea->setFont(&fonts::DejaVu40);
textArea->setTextSize(1);
textArea->setTextColor(TFT_BLACK);
pages[0] = 0;
pages[currentPage + 1] = printPage(textArea, sample);
textArea->pushSprite(25, 25);
M5.Display.endWrite();
}
App::Choices loop() {
if (M5.BtnA.wasClicked() && currentPage > 0) {
currentPage -= 1;
printPage(textArea, sample, pages[currentPage]);
textArea->pushSprite(25, 25);
} else if (M5.BtnC.wasClicked() && pages[currentPage + 1] >= 0) {
currentPage += 1;
pages[currentPage + 1] = printPage(textArea, sample, pages[currentPage]);
textArea->pushSprite(25, 25);
}
return App::Text;
}
void shutdown() {
}
protected:
bool endOfPage(M5GFX display) {
return display.getCursorY() + display.fontHeight() > display.height();
M5Canvas* textArea;
int pages[100];
int currentPage = 0;
String sample =
"Here is what to do if you want to get a lift from a Vogon: forget it. "
"They are one of the most unpleasant races in the Galaxy.\n\n"
"Not actually evil, but bad-tempered, bureaucratic, officious and callous. "
"They wouldn't even lift a finger to save their own grandmothers from the Ravenous "
"Bugblatter Beast of Traal without orders - signed in triplicate, sent in, sent back, "
"queried, lost, found, subjected to public inquiry, lost again, and finally buried in "
"soft peat for three months and recycled as firelighters.\n\n"
"The best way to get a drink out of a Vogon is to stick your finger down his throat, "
"and the best way to irritate him is to feed his grandmother to the Ravenous Bugblatter "
"Beast of Traal.\n\n"
"On no account should you allow a Vogon to read poetry at you.";
bool endOfPage(lgfx::LovyanGFX* display) {
return display->getCursorY() + display->fontHeight() > display->height();
}
int printPage(M5GFX display, String s, int index = 0) {
int printPage(lgfx::LovyanGFX* display, String s, int index = 0) {
int next = index;
bool in_whitespace = false;
display.setTextWrap(false, false);
display->setTextWrap(false, false);
display->fillScreen(TFT_WHITE);
display->setCursor(0, 0);
for (int i = index; i < s.length(); i++) {
if (endOfPage(display)) {
@ -315,37 +340,36 @@ protected:
if (s.charAt(i) == '\n') {
if (! in_whitespace) {
String word = s.substring(next, i);
if (display.textWidth(word) + display.getCursorX() > display.width()) {
display.print("\n");
if (display->textWidth(word) + display->getCursorX() > display->width()) {
display->print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
display->print(word);
next = i;
} else {
display.print(word);
display->print(word);
next = i;
}
}
in_whitespace = true;
display.print("\n");
if (endOfPage(display)) {
break;
}
} else if (s.charAt(i) == ' ') {
if (! in_whitespace) {
String word = s.substring(next, i);
if (display.textWidth(word) + display.getCursorX() > display.width()) {
display.print("\n");
if (display->textWidth(word) + display->getCursorX() > display->width()) {
display->print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
display->print(word);
next = i;
} else {
display.print(word);
display->print(word);
next = i;
}
}
@ -355,23 +379,28 @@ protected:
// End of the input, print it if we can.
String word = s.substring(next);
if (display.textWidth(word) + display.getCursorX() > display.width()) {
display.print("\n");
if (display->textWidth(word) + display->getCursorX() > display->width()) {
display->print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
display->print(word);
next = i;
} else {
display.print(word);
display->print(word);
next = i;
}
} else {
in_whitespace = false;
}
}
return next;
next += 1;
if (next >= s.length()) {
return -1;
} else {
return next;
}
}
};
@ -679,12 +708,8 @@ void loop()
M5.update();
App::Choices next = current_app;
if (M5.BtnA.wasClicked()) {
next = App::Clock;
} else if (M5.BtnB.wasClicked()) {
if (M5.BtnB.wasClicked()) {
next = App::System;
} else if (M5.BtnC.wasClicked()) {
next = App::Text;
}
try {
if (next != current_app) {